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Distance from Africa, not climate, explains within-population phenotypic diversity
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[QUOTE]Originally posted by Knowledgeiskey718: [QB] [QUOTE] [b]Posted by boofer: It simply says that africa has alot more diversity than other continents. [/b] [/QUOTE]Boofer, It seems you're not understanding what you're reading. Africa is the continent with the widest indigenous phenotypic diversity. The farther humans get from Africa, the more those populations(non-Africans) tend to actually look like one another(little diversity). Meaning all features around the world can be found indigenous to Africa, except the pale skin. [QUOTE] Taking a set of measurements across all the skulls the team showed that not only was variation [b]**highest**[/b] amongst the sample from south eastern Africa but that it did [b]**decrease**[/b] at the same rate as the genetic data the further the skull was away from Africa. [/QUOTE]Do tell how a small pond with limited variation in features, compared to Africa, the cradle, with a phenotypic ocean of features, will contribute to the African variation?? [QUOTE] Jean Hiernaux "The People of Africa" 1975 p.53, 54 "In sub-Saharan Africa, many anthropological characters show a wide range of population means or frequencies. In some of them, the **whole world range** is covered in the sub-continent. Here live the shortest and the tallest human populations, the one with the highest and the one with the lowest nose, the one with the thickest and the one with the thinnest lips in the world. In this area, the range of the **average nose widths** covers **92 percent** of the world range: **only a narrow range of extremely low means are absent from the African record.** Means for head diameters cover about 80 per cent of the world range; 60 per cent is the corresponding value for a variable once cherished by physical anthropologists, the cephalic index, or ratio of the head width to head length expressed as a percentage....." [/QUOTE]Btw, did you even bother reading explorers post?? [QUOTE]Originally posted by The Explorer: [qb] Boofer, 1)The study was not intended to negate "back-migration". Whether potential back-migration has modified some Africans from a physiological standpoint, is trivial to and has no bearing on what the study is relaying -- greatest autochthonous diversity in Africa, especially sub-Saharan Africa, vs. elsewhere. 2)Likewise, it can be said that the regions you speak of, as original points of the said back-migration, have also been impacted by gene flow from mainland Africa. 3)Though the general idea of greatest diversity in Africa had been already known by some of us well-read and learnt ones, the pattern observed in this study, about the "progressive loss of diversity" in correlation to "progressive increase of distance" away from sub-Saharan Africa is necessarily new information. It ties into loss of diversity attained in bottlenecks that generally mark migration events. "Progressive loss of diversity" obviously speaks to additional bottlenecks linked to further dispersals of OOA migrants. Plus, Rasol makes a good point about persisting ignorance and/or wishful thinking on the matter of African diversity, especially in sub-Saharan Africa. [/qb][/QUOTE] [/QB][/QUOTE]
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