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99-772: The term Negrito ( / n ɪ ˈ ɡ r iː t oʊ / ; lit. ' little black people ' ) refers to several diverse ethnic groups who inhabit isolated parts of Southeast Asia and the Andaman Islands . Populations often described as Negrito include: the Andamanese peoples (including the Great Andamanese , the Onge , the Jarawa , and the Sentinelese ) of the Andaman Islands,
198-444: A Brownian motion model of trait evolution along a phylogeny. More recent methods also quantify the strength of convergence. One drawback to keep in mind is that these methods can confuse long-term stasis with convergence due to phenotypic similarities. Stasis occurs when there is little evolutionary change among taxa. Distance-based measures assess the degree of similarity between lineages over time. Frequency-based measures assess
297-428: A nucleophile . In order to activate that nucleophile, they orient an acidic and a basic residue in a catalytic triad . The chemical and physical constraints on enzyme catalysis have caused identical triad arrangements to evolve independently more than 20 times in different enzyme superfamilies . Threonine proteases use the amino acid threonine as their catalytic nucleophile . Unlike cysteine and serine, threonine
396-518: A broader, somewhat derogatory sense to refer to Muslims , especially those of Arab or Berber ancestry, whether living in North Africa or Iberia. Moors were not a distinct or self-defined people. Medieval and early modern Europeans applied the name to Muslim Arabs, Berbers, Sub-Saharan Africans and Europeans alike. Isidore of Seville , writing in the 7th century, claimed that the Latin word Maurus
495-462: A father who was a lighter-skinned Egyptian . In response to an advertisement for an acting position, as a young man he said, "I am not white but I am not exactly black either. My blackness is tending to reddish". Due to the patriarchal nature of Arab society, Arab men, including during the slave trade in North Africa, enslaved more African women than men. The female slaves were often put to work in domestic service and agriculture. The men interpreted
594-575: A high concentration of cerebrosides in the skin of their wings. This improves skin flexibility, a trait useful for flying animals; other mammals have a far lower concentration. The extinct pterosaurs independently evolved wings from their fore- and hindlimbs, while insects have wings that evolved separately from different organs. Flying squirrels and sugar gliders are much alike in their mammalian body plans, with gliding wings stretched between their limbs, but flying squirrels are placentals while sugar gliders are marsupials, widely separated within
693-639: A history of discrimination. These descendants of the Zanj have sought minority status from the government, which would reserve some seats in Parliament for representatives of their population. According to Alamin M. Mazrui et al., generally in the Arabian Peninsula and neighboring countries, most of these communities identify as both black and Arab. Afro-Iranians are people of black African ancestry residing in Iran. During
792-635: A molecular level to toxins. One well-characterized example is the evolution of resistance to cardiotonic steroids (CTSs) via amino acid substitutions at well-defined positions of the α-subunit of Na ,K -ATPase (ATPalpha). Variation in ATPalpha has been surveyed in various CTS-adapted species spanning six insect orders. Among 21 CTS-adapted species, 58 (76%) of 76 amino acid substitutions at sites implicated in CTS resistance occur in parallel in at least two lineages. 30 of these substitutions (40%) occur at just two sites in
891-568: A phylogenetic reconstruction, and are sometimes explicitly sought by investigators. The methods applied to infer convergent evolution depend on whether pattern-based or process-based convergence is expected. Pattern-based convergence is the broader term, for when two or more lineages independently evolve patterns of similar traits. Process-based convergence is when the convergence is due to similar forces of natural selection . Earlier methods for measuring convergence incorporate ratios of phenotypic and phylogenetic distance by simulating evolution with
990-477: A slave; his mother was Fulani and a concubine of his father. In early 1991, non-Arabs of the Zaghawa people of Sudan attested that they were victims of an intensifying Arab apartheid campaign, segregating Arabs and non-Arabs (specifically, people of Nilotic ancestry). Sudanese Arabs, who controlled the government, were widely referred to as practicing apartheid against Sudan's non-Arab citizens. The government
1089-501: A steadily decreasing probability of retaining potential functionality over time. The time scale of this process varies greatly in different phylogenies; in mammals and birds, there is a reasonable probability of remaining in the genome in a potentially functional state for around 6 million years. When two species are similar in a particular character, evolution is defined as parallel if the ancestors were also similar, and convergent if they were not. Some scientists have argued that there
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#17330851920981188-438: A trait presently identified with at least primates , corvids , and cetaceans . In cladistics, a homoplasy is a trait shared by two or more taxa for any reason other than that they share a common ancestry. Taxa which do share ancestry are part of the same clade ; cladistics seeks to arrange them according to their degree of relatedness to describe their phylogeny . Homoplastic traits caused by convergence are therefore, from
1287-421: Is divergent evolution , where related species evolve different traits. Convergent evolution is similar to parallel evolution , which occurs when two independent species evolve in the same direction and thus independently acquire similar characteristics; for instance, gliding frogs have evolved in parallel from multiple types of tree frog . Many instances of convergent evolution are known in plants , including
1386-481: Is a racialized classification of people, usually a political and skin color -based category for specific populations with a mid- to dark brown complexion . Not all people considered "black" have dark skin ; in certain countries, often in socially based systems of racial classification in the Western world , the term "black" is used to describe persons who are perceived as dark-skinned compared to other populations. It
1485-427: Is a secondary alcohol (i.e. has a methyl group). The methyl group of threonine greatly restricts the possible orientations of triad and substrate, as the methyl clashes with either the enzyme backbone or the histidine base. Consequently, most threonine proteases use an N-terminal threonine in order to avoid such steric clashes . Several evolutionarily independent enzyme superfamilies with different protein folds use
1584-478: Is a South African woman who was classified as Coloured by authorities during the apartheid era, due to her skin colour and hair texture , although her parents could prove at least three generations of European ancestors. At age 10, she was expelled from her all-white school. The officials' decisions based on her anomalous appearance disrupted her family and adult life. She was the subject of the 2008 biographical dramatic film Skin , which won numerous awards. During
1683-443: Is a continuum between parallel and convergent evolution, while others maintain that despite some overlap, there are still important distinctions between the two. When the ancestral forms are unspecified or unknown, or the range of traits considered is not clearly specified, the distinction between parallel and convergent evolution becomes more subjective. For instance, the striking example of similar placental and marsupial forms
1782-463: Is a membrane stretched across four extremely elongated fingers and the legs. The airfoil of the bird wing is made of feathers , strongly attached to the forearm (the ulna) and the highly fused bones of the wrist and hand (the carpometacarpus ), with only tiny remnants of two fingers remaining, each anchoring a single feather. So, while the wings of bats and birds are functionally convergent, they are not anatomically convergent. Birds and bats also share
1881-664: Is described by Richard Dawkins in The Blind Watchmaker as a case of convergent evolution, because mammals on each continent had a long evolutionary history prior to the extinction of the dinosaurs under which to accumulate relevant differences. The enzymology of proteases provides some of the clearest examples of convergent evolution. These examples reflect the intrinsic chemical constraints on enzymes, leading evolution to converge on equivalent solutions independently and repeatedly. Serine and cysteine proteases use different amino acid functional groups (alcohol or thiol) as
1980-442: Is most commonly used for people of sub-Saharan African ancestry, Indigenous Australians and Melanesians , though it has been applied in many contexts to other groups, and is no indicator of any close ancestral relationship whatsoever. Indigenous African societies do not use the term black as a racial identity outside of influences brought by Western cultures. Contemporary anthropologists and other scientists, while recognizing
2079-800: Is reported that African immigrants in Turkey regularly face economic and social challenges, notably racism and opposition to immigration by locals. The Siddi are an ethnic group inhabiting India and Pakistan . Members are descended from the Bantu peoples of Southeast Africa . Some were merchants, sailors, indentured servants , slaves or mercenaries. The Siddi population is currently estimated at 270,000–350,000 individuals, living mostly in Karnataka , Gujarat , and Hyderabad in India and Makran and Karachi in Pakistan. In
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#17330851920982178-542: Is responsible, say with brown dominant to blue eye colour . However, a single locus is responsible for about 80% of the variation. In lemurs, the differences between blue and brown eyes are not completely known, but the same gene locus is not involved. While most plant species are perennial , about 6% follow an annual life cycle, living for only one growing season. The annual life cycle independently emerged in over 120 plant families of angiosperms. The prevalence of annual species increases under hot-dry summer conditions in
2277-632: Is the Spanish diminutive of negro, i.e., "little black person"); it is what the Spaniards called the aborigines that they encountered in the Philippines . The term Negrito itself has come under criticism in countries like Malaysia, where it is now interchangeable with the more acceptable Semang , although this term actually refers to a specific group. They have dark skin, often curly-hair and Asiatic facial characteristics, and are stockily built. Negritos in
2376-409: Is the camera eye of cephalopods (such as squid and octopus), vertebrates (including mammals) and cnidarians (such as jellyfish). Their last common ancestor had at most a simple photoreceptive spot, but a range of processes led to the progressive refinement of camera eyes —with one sharp difference: the cephalopod eye is "wired" in the opposite direction, with blood and nerve vessels entering from
2475-457: Is the independent evolution of similar features in species of different periods or epochs in time. Convergent evolution creates analogous structures that have similar form or function but were not present in the last common ancestor of those groups. The cladistic term for the same phenomenon is homoplasy . The recurrent evolution of flight is a classic example, as flying insects , birds , pterosaurs , and bats have independently evolved
2574-768: The AP Stylebook , changed their guides to capitalize the 'b' in 'black', following the 2020 murder of George Floyd , an African American . The ASA Style Guide says that the 'b' should not be capitalized. Some perceive the term 'black' as a derogatory, outdated, reductive or otherwise unrepresentative label, and as a result neither use nor define it, especially in African countries with little to no history of colonial racial segregation . Numerous communities of dark-skinned peoples are present in North Africa , some dating from prehistoric communities. Others descend from migrants via
2673-522: The Chenopodiaceae and the Amaranthaceae . Fruits with a wide variety of structural origins have converged to become edible. Apples are pomes with five carpels ; their accessory tissues form the apple's core, surrounded by structures from outside the botanical fruit, the receptacle or hypanthium . Other edible fruits include other plant tissues; the fleshy part of a tomato is the walls of
2772-665: The Makran strip of the Sindh and Balochistan provinces in southwestern Pakistan , these Bantu descendants are known as the Makrani. There was a brief "Black Power" movement in Sindh in the 1960s and many Siddi are proud of and celebrate their African ancestry. Negritos , are a collection of various, often unrelated peoples, who were once considered a single distinct population of closely related groups, but genetic studies showed that they descended from
2871-718: The Negev town of Dimona . Unknown numbers of black converts to Judaism reside in Israel, most of them converts from the United Kingdom, Canada, and the United States. Additionally, there are around 60,000 non-Jewish African immigrants in Israel, some of whom have sought asylum. Most of the migrants are from communities in Sudan and Eritrea , particularly the Niger-Congo -speaking Nuba groups of
2970-526: The Netherlands who are of Black African or Afro-Caribbean ancestry. They tend to be from the former and present Dutch overseas territories of Aruba , Bonaire , Curaçao , Sint Maarten and Suriname . The Netherlands also has sizable Cape Verdean and other African communities. As of 2021, there were at least 232,000 people of recent Black-African immigrant background living in Portugal . They mainly live in
3069-585: The Qajar dynasty , many wealthy households imported black African women and children as slaves to perform domestic work. This slave labor was drawn exclusively from the Zanj, who were Bantu -speaking peoples that lived along the African Great Lakes , in an area roughly comprising modern-day Tanzania , Mozambique and Malawi . About 150,000 East African and black people live in Israel , amounting to just over 2% of
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3168-450: The Quran to permit sexual relations between a male master and his enslaved females outside of marriage (see Ma malakat aymanukum and sex ), leading to many mixed-race children. When an enslaved woman became pregnant with her Arab master's child, she was considered as umm walad or "mother of a child", a status that granted her privileged rights. The child was given rights of inheritance to
3267-746: The Semang peoples (among them, the Batek people ) of Peninsular Malaysia , the Maniq people of Southern Thailand , as well as the Aeta of Luzon , the Ati and Tumandok of Panay , the Mamanwa of Mindanao , and about 30 other officially recognized ethnic groups in the Philippines . The word Negrito, the Spanish diminutive of negro , is used to mean "little black person." This usage
3366-762: The Southall Black Sisters , which started with a mainly British Asian constituency, and the National Black Police Association , which has a membership of "African, African-Caribbean and Asian origin". As African states became independent in the 1960s, the Soviet Union offered many of their citizens the chance to study in Russia . Over a period of 40 years, about 400,000 African students from various countries moved to Russia to pursue higher studies, including many black Africans. This extended beyond
3465-670: The Western Cape ). The Coloured definition occupied an intermediary political position between the Black and White definitions in South Africa. It imposed a system of legal racial segregation, a complex of laws known as apartheid . The apartheid bureaucracy devised complex (and often arbitrary) criteria in the Population Registration Act of 1945 to determine who belonged in which group. Minor officials administered tests to enforce
3564-619: The pericarp . This implies convergent evolution under selective pressure, in this case the competition for seed dispersal by animals through consumption of fleshy fruits. Seed dispersal by ants ( myrmecochory ) has evolved independently more than 100 times, and is present in more than 11,000 plant species. It is one of the most dramatic examples of convergent evolution in biology. Carnivory has evolved multiple times independently in plants in widely separated groups. In three species studied, Cephalotus follicularis , Nepenthes alata and Sarracenia purpurea , there has been convergence at
3663-446: The proboscis of flower-visiting insects such as bees and flower beetles , or the biting-sucking mouthparts of blood-sucking insects such as fleas and mosquitos . Opposable thumbs allowing the grasping of objects are most often associated with primates , like humans and other apes, monkeys, and lemurs. Opposable thumbs also evolved in giant pandas , but these are completely different in structure, having six fingers including
3762-587: The İzmir area through the population exchange between Greece and Turkey in 1923, or indirectly from Ayvalık in pursuit of work. Apart from the historical Afro-Turk presence Turkey also hosts a sizeable immigrant black population since the end of the 1990s. The community is composed mostly of modern immigrants from Ghana, Ethiopia, DRC, Sudan, Nigeria, Kenya, Eritrea, Somalia and Senegal. According to official figures 1.5 million Africans live in Turkey and around 25% of them are located in Istanbul . Other studies state
3861-508: The ANC ( African National Congress )". In 2008, the High Court in South Africa ruled that Chinese South Africans who were residents during the apartheid era (and their descendants) are to be reclassified as "Black people," solely for the purposes of accessing affirmative action benefits, because they were also "disadvantaged" by racial discrimination. Chinese people who arrived in the country after
3960-588: The Arab government of Sudan of practicing acts of racism against black citizens. According to Ayittey, "In Sudan... the Arabs monopolized power and excluded blacks – Arab apartheid." Many African commentators joined Ayittey in accusing Sudan of practicing Arab apartheid. In the Sahara , the native Tuareg Berber populations kept " negro " slaves. Most of these captives were of Nilo-Saharan extraction, and were either purchased by
4059-558: The Caribbean after World War II; the first symbolic movement was of those who came on the ship the Empire Windrush and, hence, those who migrated between 1948 and 1970 are known as the Windrush generation . The preferred official umbrella term is "black, Asian and minority ethnic" ( BAME ), but sometimes the term "black" is used on its own, to express unified opposition to racism , as in
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4158-524: The European colonialists acquired control of territory, they generally pushed the mixed-race and African populations into second-class status. During the first half of the 20th century, the white-dominated government classified the population according to four main racial groups: Black , White , Asian (mostly Indian ), and Coloured . The Coloured group included people of mixed Bantu, Khoisan, and European ancestry (with some Malay ancestry, especially in
4257-573: The Horn of Africa and then sold off to slave merchants. The earliest representation of this tradition dates from a seventh or eighth century BC inscription belonging to the Kingdom of Damat . These captives and others of analogous morphology were distinguished as tsalim barya (dark-skinned slave) in contrast with the Afroasiatic-speaking nobles or saba qayh ("red men") or light-skinned slave; while on
4356-570: The Mesozoic ) all converged on the same streamlined shape. A similar shape and swimming adaptations are even present in molluscs, such as Phylliroe . The fusiform bodyshape (a tube tapered at both ends) adopted by many aquatic animals is an adaptation to enable them to travel at high speed in a high drag environment. Similar body shapes are found in the earless seals and the eared seals : they still have four legs, but these are strongly modified for swimming. The marsupial fauna of Australia and
4455-517: The N-terminal residue as a nucleophile. This commonality of active site but difference of protein fold indicates that the active site evolved convergently in those families. Conus geographus produces a distinct form of insulin that is more similar to fish insulin protein sequences than to insulin from more closely related molluscs, suggesting convergent evolution, though with the possibility of horizontal gene transfer . Distant homologues of
4554-649: The Neolithic expansion and must have persisted into historical times, as suggested by evidence from morphological features of human skeletal remains dating from around 6,000 years ago resembling Negritos (especially Aetas in northern Luzon), and further corroborated by Chinese reports from the Qing period rule of Taiwan (1684 to 1895) and from tales of Taiwanese indigenous peoples about people with "dark skin, short-and-small body stature, frizzy hair, and occupation in forested mountains or remote caves". Black people Black
4653-545: The Philippines frequently face discrimination. Because of their traditional hunter-gatherer lifestyle, they are marginalized and live in poverty, unable to find employment. While census collection of ethnic background is illegal in France , it is estimated that there are about 2.5 – 5 million black people residing there. As of 2020, there are approximately one million black people living in Germany. Afro-Dutch are residents of
4752-761: The Soviet Union to many countries of the Eastern bloc . Due to the slave trade in the Ottoman Empire that had flourished in the Balkans , the coastal town of Ulcinj in Montenegro had its own black community. In 1878, that community consisted of about 100 people. Indigenous Australians have been referred to as "black people" in Australia since the early days of European settlement . While originally related to skin colour ,
4851-652: The State of Bahia, in the 21st century Afro-multiracials in the Arab world , including Arabs in North Africa, self-identify in ways that resemble multi-racials in Latin America . He claims that darker-toned Arabs, much like darker-toned Latin Americans , consider themselves white because they have some distant white ancestry. Egyptian President Anwar Sadat had a mother who was a dark-skinned Nubian Sudanese ( Sudanese Arab ) woman and
4950-807: The Tuareg nobles from slave markets in the Western Sudan or taken during raids. Their origin is denoted via the Ahaggar Berber word Ibenheren (sing. Ébenher ), which alludes to slaves that only spoke a Nilo-Saharan language. These slaves were also sometimes known by the borrowed Songhay term Bella . Similarly, the Sahrawi indigenous peoples of the Western Sahara observed a class system consisting of high castes and low castes. Outside of these traditional tribal boundaries were "Negro" slaves, who were drawn from
5049-475: The United Kingdom, "black" was historically equivalent with " person of color ", a general term for non-European peoples. While the term "person of color" is commonly used and accepted in the United States , the near-sounding term " colored person " is considered highly offensive, except in South Africa, where it is a descriptor for a person of mixed race . In other regions such as Australasia , settlers applied
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#17330851920985148-456: The United States, they are also called "black Asians" or "Blasians". Historically, Afro-Asian populations have been marginalized as a result of human migration and social conflict. In the medieval Arab world, the ethnic designation of "Black" encompassed not only Zanj , or Africans, but also communities like Zutt , Sindis and Indians from the Indian subcontinent . Historians estimate that between
5247-507: The adjective "black" to the indigenous population. It was universally regarded as highly offensive in Australia until the 1960s and 70s. "Black" was generally not used as a noun, but rather as an adjective qualifying some other descriptor (e.g. "black ****"). As desegregation progressed after the 1967 referendum, some Aboriginals adopted the term, following the American fashion, but it remains problematic. Several American style guides, including
5346-667: The advent of Islam in 650 CE and the abolition of slavery in the Arabian Peninsula in the mid-20th century, 10 to 18 million black Africans (known as the Zanj) were enslaved by east African slave traders and transported to the Arabian Peninsula and neighboring countries. This number far exceeded the number of slaves who were taken to the Americas. Slavery in Saudi Arabia and slavery in Yemen
5445-441: The apartheid era, those classed as "Coloured" were oppressed and discriminated against. But, they had limited rights and overall had slightly better socioeconomic conditions than those classed as "Black". The government required that Blacks and Coloureds live in areas separate from Whites, creating large townships located away from the cities as areas for Blacks. In the post-apartheid era, the Constitution of South Africa has declared
5544-471: The back of the retina, rather than the front as in vertebrates. As a result, vertebrates have a blind spot . Birds and bats have homologous limbs because they are both ultimately derived from terrestrial tetrapods , but their flight mechanisms are only analogous, so their wings are examples of functional convergence. The two groups have independently evolved their own means of powered flight. Their wings differ substantially in construction. The bat wing
5643-543: The basis of perceived similarities in stature and complexion. (Historically, the label Negrito has also been used to refer to African pygmies.) The appropriateness of bundling peoples of different ethnicities by similarities in stature and complexion has been called into question. There are over 100,000 Negritos in the Philippines. In 2010, there were 50,236 Aeta people in the Philippines. The Ati people 55,473 (2020 census) Officially, Malaysia had approximately 4,800 Negrito (Semangs). This number increases if we include some of
5742-451: The classifications. When it was unclear from a person's physical appearance whether the individual should be considered Coloured or Black, the " pencil test " was used. A pencil was inserted into a person's hair to determine if the hair was kinky enough to hold the pencil, rather than having it pass through, as it would with smoother hair. If so, the person was classified as Black. Such classifications sometimes divided families. Sandra Laing
5841-655: The country to be a "Non-racial democracy". In an effort to redress past injustices, the ANC government has introduced laws in support of affirmative action policies for Blacks; under these they define "Black" people to include "Africans", "Coloureds" and "Asians". Some affirmative action policies favor "Africans" over "Coloureds" in terms of qualifying for certain benefits. Some South Africans categorized as "African Black" say that "Coloureds" did not suffer as much as they did during apartheid. "Coloured" South Africans are known to discuss their dilemma by saying, "we were not white enough under apartheid, and we are not black enough under
5940-437: The dolphin; among marine mammals; between giant and red pandas; and between the thylacine and canids. Convergence has also been detected in a type of non-coding DNA , cis-regulatory elements , such as in their rates of evolution; this could indicate either positive selection or relaxed purifying selection . Swimming animals including fish such as herrings , marine mammals such as dolphins , and ichthyosaurs ( of
6039-444: The end of apartheid do not qualify for such benefits. Other than by appearance, "Coloureds" can usually be distinguished from "Blacks" by language. Most speak Afrikaans or English as a first language , as opposed to Bantu languages such as Zulu or Xhosa . They also tend to have more European-sounding names than Bantu names. " Afro-Asians " or "African-Asians" are persons of mixed sub-Saharan African and Asian ancestry. In
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#17330851920986138-617: The exposed surfaces of the proteins, where they might interact with other components of the cell or the digestive fluid. The authors also found that homologous genes in the non-carnivorous plant Arabidopsis thaliana tend to have their expression increased when the plant is stressed, leading the authors to suggest that stress-responsive proteins have often been co-opted in the repeated evolution of carnivory. Phylogenetic reconstruction and ancestral state reconstruction proceed by assuming that evolution has occurred without convergence. Convergent patterns may, however, appear at higher levels in
6237-412: The father's property, so mixed-race children could share in any wealth of the father. Because the society was patrilineal , the children inherited their fathers' social status at birth and were born free. Some mixed-race children succeeded their respective fathers as rulers, such as Sultan Ahmad al-Mansur , who ruled Morocco from 1578 to 1608. He was not technically considered as a mixed-race child of
6336-426: The former Spanish colony Equatorial Guinea . Today, there are an estimated 683,000 Afro-Spaniards in Spain . According to the Office for National Statistics , at the 2001 census there were more than a million black people in the United Kingdom; 1% of the total population described themselves as "Black Caribbean", 0.8% as "Black African", and 0.2% as "Black other". Britain encouraged the immigration of workers from
6435-480: The four species-rich families of annuals ( Asteraceae , Brassicaceae , Fabaceae , and Poaceae ), indicating that the annual life cycle is adaptive. C 4 photosynthesis , one of the three major carbon-fixing biochemical processes, has arisen independently up to 40 times . About 7,600 plant species of angiosperms use C 4 carbon fixation, with many monocots including 46% of grasses such as maize and sugar cane , and dicots including several species in
6534-458: The half-castes belong neither to the aboriginal nor to the whites, yet, on the whole, they have more leaning towards the former; ... One thing is certain and that is that the white population as a whole will never mix with half-castes... the best and kindest thing is to place them on reserves along with the natives, train them in the same schools and encourage them to marry amongst themselves. Convergent evolution Convergent evolution
6633-402: The historical trans-Saharan trade or, after the Arab invasions of North Africa in the 7th century, from slaves from the trans-Saharan slave trade in North Africa. In the 18th century, the Moroccan Sultan Moulay Ismail "the Warrior King" (1672–1727) raised a corps of 150,000 black soldiers, called his Black Guard . According to Carlos Moore , resident scholar at Brazil's University of
6732-407: The lineages diverged and became genetically isolated, the skin of both groups lightened more, and that additional lightening was due to different genetic changes. Lemurs and humans are both primates. Ancestral primates had brown eyes, as most primates do today. The genetic basis of blue eyes in humans has been studied in detail and much is known about it. It is not the case that one gene locus
6831-418: The lives of Indigenous Australians – where they lived, their employment, marriage, education and included the power to separate children from their parents. Aborigines were not allowed to vote and were often confined to reserves and forced into low paid or effectively slave labour. The social position of mixed-race or " half-caste " individuals varied over time. A 1913 report by Baldwin Spencer states that:
6930-400: The majority of Africans in Turkey lives in Istanbul and report Tarlabaşı , Dolapdere , Kumkapı , Yenikapı and Kurtuluş as having a strong African presence. Most of the African immigrants in Turkey come to Turkey to further migrate to Europe. Immigrants from Eastern Africa are usually refugees, meanwhile Western and Central African immigration is reported to be economically driven. It
7029-402: The majority population of their respective homeland. Discrimination and poverty are often problems, caused either by their lower social position and/or their hunter-gatherer lifestyles. Based on perceived physical similarities, Negritos were once considered a single population of closely related people. However, genetic studies suggest that they consist of several separate groups descended from
7128-516: The mammal lineage from the placentals. Hummingbird hawk-moths and hummingbirds have evolved similar flight and feeding patterns. Insect mouthparts show many examples of convergent evolution. The mouthparts of different insect groups consist of a set of homologous organs, specialised for the dietary intake of that insect group. Convergent evolution of many groups of insects led from original biting-chewing mouthparts to different, more specialised, derived function types. These include, for example,
7227-454: The metal ion transporters ZIP in land plants and chlorophytes have converged in structure, likely to take up Fe efficiently. The IRT1 proteins from Arabidopsis thaliana and rice have extremely different amino acid sequences from Chlamydomonas ' s IRT1, but their three-dimensional structures are similar, suggesting convergent evolution. Many examples of convergent evolution exist in insects in terms of developing resistance at
7326-405: The molecular level. Carnivorous plants secrete enzymes into the digestive fluid they produce. By studying phosphatase , glycoside hydrolase , glucanase , RNAse and chitinase enzymes as well as a pathogenesis-related protein and a thaumatin -related protein, the authors found many convergent amino acid substitutions. These changes were not at the enzymes' catalytic sites, but rather on
7425-492: The nation's population. The vast majority of these, some 120,000, are Beta Israel , most of whom are recent immigrants who came during the 1980s and 1990s from Ethiopia . In addition, Israel is home to more than 5,000 members of the African Hebrew Israelites of Jerusalem movement that are ancestry of African Americans who emigrated to Israel in the 20th century, and who reside mainly in a distinct neighborhood in
7524-589: The other hand, western racial category standards do not differentiate between saba qayh ("red men"—light-skinned) or saba tiqur ("black men"—dark-skinned) Horn Africans (of either Afroasiatic-speaking, Nilotic-speaking or Bantu origin) thus considering all of them as "black people" (and in some case "negro") according to Western society's notion of race. In South Africa , the period of colonisation resulted in many unions and marriages between European and Africans ( Bantu peoples of South Africa and Khoisans ) from various tribes, resulting in mixed-race children. As
7623-476: The physical and morphological phenotypes of Negritos, such as short stature, a wide and snub nose, curly hair and dark skin, " are shaped by novel mechanisms for adaptation to tropical rainforests " through convergent evolution and positive selection , rather than a remnant of a shared common ancestor, as suggested previously by some researchers. A Negrito-like population was most likely also present in Taiwan before
7722-474: The placental mammals of the Old World have several strikingly similar forms, developed in two clades, isolated from each other. The body, and especially the skull shape, of the thylacine (Tasmanian tiger or Tasmanian wolf) converged with those of Canidae such as the red fox, Vulpes vulpes . As a sensory adaptation, echolocation has evolved separately in cetaceans (dolphins and whales) and bats, but from
7821-401: The point of view of cladistics, confounding factors which could lead to an incorrect analysis. In some cases, it is difficult to tell whether a trait has been lost and then re-evolved convergently, or whether a gene has simply been switched off and then re-enabled later. Such a re-emerged trait is called an atavism . From a mathematical standpoint, an unused gene ( selectively neutral ) has
7920-507: The populations or individual groups among Orang Asli who have either assimilated Negrito population or have admixed origins. According to the 2006 census, the number of Orang Asli was 141,230 Andamanese of India with just c. over 500. Thailand Negrito Maniq is estimated 300, divided into several clans. Other puts it at 382 or less than 500. Most groups designated as "Negrito" lived as hunter-gatherers , while some also used agriculture , such as plant harvesting. Today most live assimilated to
8019-404: The protein (positions 111 and 122). CTS-adapted species have also recurrently evolved neo-functionalized duplications of ATPalpha, with convergent tissue-specific expression patterns. Convergence occurs at the level of DNA and the amino acid sequences produced by translating structural genes into proteins . Studies have found convergence in amino acid sequences in echolocating bats and
8118-434: The reality of biological variation between different human populations, regard the concept of a unified, distinguishable "Black race" as socially constructed . Different societies apply different criteria regarding who is classified "black", and these social constructs have changed over time. In a number of countries, societal variables affect classification as much as skin color, and the social criteria for "blackness" vary. In
8217-594: The regions of Lisbon , Porto , Coimbra . As Portugal doesn't collect information dealing with ethnicity, the estimate includes only people that, as of 2021, hold the citizenship of a Sub Saharan African country or people who have acquired Portuguese citizenship from 2008 to 2021, thus excluding descendants, people of more distant African ancestry or people who have settled in Portugal generations ago and are now Portuguese citizens . The term " Moors " has been used in Europe in
8316-462: The repeated development of C 4 photosynthesis , seed dispersal by fleshy fruits adapted to be eaten by animals, and carnivory . In morphology, analogous traits arise when different species live in similar ways and/or a similar environment, and so face the same environmental factors. When occupying similar ecological niches (that is, a distinctive way of life) similar problems can lead to similar solutions. The British anatomist Richard Owen
8415-821: The same ancient East Eurasian meta-population that gave rise to modern East Asian peoples and Oceanian peoples , as well as displaying genetic heterogeneity. The Negritos form the indigenous population of Southeast Asia, but were largely absorbed by Austroasiatic- and Austronesian-speaking groups who migrated from southern East Asia into Mainland and Insular Southeast Asia with the Neolithic expansion. The remainders form minority groups in geographically isolated regions. Genetic studies provided mixed evidence of modern Negrito populations, with admixtures in different. Studies indicate that Negrito populations are closer to their neighboring non-Negrito communities in their paternal heritage and overall DNA on average. It has been found that
8514-510: The same ancient East Eurasian meta-population which gave rise to modern East Asian peoples , and consist of several separate groups, as well as displaying genetic heterogeneity. They inhabit isolated parts of Southeast Asia , and are now confined primarily to Southern Thailand, the Malay Peninsula, and the Andaman Islands of India. Negrito means "little black people" in Spanish (negrito
8613-401: The same conditions were encountered again, evolution could take a very different course." Simon Conway Morris disputes this conclusion, arguing that convergence is a dominant force in evolution, and given that the same environmental and physical constraints are at work, life will inevitably evolve toward an "optimum" body plan, and at some point, evolution is bound to stumble upon intelligence,
8712-467: The same genetic mutations. The Gymnotiformes of South America and the Mormyridae of Africa independently evolved passive electroreception (around 119 and 110 million years ago, respectively). Around 20 million years after acquiring that ability, both groups evolved active electrogenesis , producing weak electric fields to help them detect prey. One of the best-known examples of convergent evolution
8811-598: The southern Nuba Mountains ; some are illegal immigrants. Beginning several centuries ago, during the period of the Ottoman Empire , tens of thousands of Zanj captives were brought by slave traders to plantations and agricultural areas situated between Antalya and Istanbul , which gave rise to the Afro-Turk population in present-day Turkey . Some of their ancestry remained in situ , and many migrated to larger cities and towns. Other black slaves were transported to Crete , from where they or their descendants later reached
8910-485: The surrounding areas. In Ethiopia and Somalia , the slave classes mainly consisted of captured peoples from the Sudanese-Ethiopian and Kenyan-Somali international borders or other surrounding areas of Nilotic and Bantu peoples who were collectively known as Shanqella and Adone (both analogues to "negro" in an English-speaking context). Some of these slaves were captured during territorial conflicts in
9009-464: The term is used today to indicate Aboriginal or Torres Strait Islander ancestry in general and can refer to people of any skin pigmentation. Being identified as either "black" or "white" in Australia during the 19th and early 20th centuries was critical in one's employment and social prospects. Various state-based Aboriginal Protection Boards were established which had virtually complete control over
9108-554: The thumb, which develops from a wrist bone entirely separately from other fingers. Convergent evolution in humans includes blue eye colour and light skin colour. When humans migrated out of Africa , they moved to more northern latitudes with less intense sunlight. It was beneficial to them to reduce their skin pigmentation . It appears certain that there was some lightening of skin colour before European and East Asian lineages diverged, as there are some skin-lightening genetic differences that are common to both groups. However, after
9207-413: The useful capacity of flight. Functionally similar features that have arisen through convergent evolution are analogous , whereas homologous structures or traits have a common origin but can have dissimilar functions. Bird, bat, and pterosaur wings are analogous structures, but their forelimbs are homologous, sharing an ancestral state despite serving different functions. The opposite of convergence
9306-573: Was abolished in 1962, slavery in Dubai in 1963, and slavery in Oman in 1970. Several factors affected the visibility of descendants of this diaspora in 21st-century Arab societies: The traders shipped more female slaves than males, as there was a demand for them to serve as concubines in harems in the Arabian Peninsula and neighboring countries. Male slaves were castrated in order to serve as harem guards. The death toll of black African slaves from forced labor
9405-432: Was accused of "deftly manipulating Arab solidarity" to carry out policies of apartheid and ethnic cleansing . Sudanese Arabs are also black people in that they are culturally and linguistically Arabized indigenous peoples of Sudan of mostly Nilo-Saharan , Nubian , and Cushitic ancestry; their skin tone and appearance resembles that of other black people. American University economist George Ayittey accused
9504-407: Was coined by 16th-century Spanish missionaries operating in the Philippines, and was borrowed by other European travellers and colonialists across Austronesia to label various peoples perceived as sharing relatively small physical stature and dark skin. Contemporary usage of an alternative Spanish epithet, Negrillos , also tended to bundle these peoples with the pygmy peoples of Central Africa on
9603-795: Was derived from the Greek mauron , μαύρον, which is the Greek word for "black". Indeed, by the time Isidore of Seville came to write his Etymologies , the word Maurus or "Moor" had become an adjective in Latin, "for the Greeks call black, mauron". "In Isidore's day, Moors were black by definition..." Afro-Spaniards are Spanish nationals of West / Central African ancestry. Today, they mainly come from Cameroon , Equatorial Guinea , Ghana , Gambia , Mali , Nigeria and Senegal. Additionally, many Afro-Spaniards born in Spain are from
9702-450: Was high. The mixed-race children of female slaves and Arab owners were assimilated into the Arab owners' families under the patrilineal kinship system . As a result, few distinctive Afro-Arab communities have survived in the Arabian Peninsula and neighboring countries. Distinctive and self-identified black communities have been reported in countries such as Iraq, with a reported 1.2 million black people ( Afro-Iraqis ), and they attest to
9801-408: Was the first to identify the fundamental difference between analogies and homologies . In biochemistry, physical and chemical constraints on mechanisms have caused some active site arrangements such as the catalytic triad to evolve independently in separate enzyme superfamilies . In his 1989 book Wonderful Life , Stephen Jay Gould argued that if one could "rewind the tape of life [and]
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