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Is Kmtian wavy and straight hair the only trait not shared with Ancient Nubians?
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[QUOTE]Originally posted by lamin: [QB] [QUOTE][b]My theory which Swenet agrees is that loose hair is an adaptation to arid conditions, especially desert like climates as that was the situation for the OOA migrants as it is for the African Saharans and Sahelians as it is for Australian aboriginals—-ALL of whom have loose wavy hair! [/b][/QUOTE]How then do we explain the hair of the Southern African San who apparently evolved in extremely dry desert conditions. The Kalahari and Namib deserts are vast areas that have been like the Sahel and Sahara zones in terms of ecology, climate, etc. They have been in that area for more than 25,000 years yet they are not as heavily pigmented as Sahel groups such as the Dogon, Dinka or Nuer. On the other hand the hair is extremely coiled--more so that other African groups. The most apt theory it seems is one based on the idea of "population isolates" living for thousands of years and breeding among themselves uniquely. [It's much the same way that languages develop--but at a much faster rate]. These "population isolates" over time develop traits that have no particular adaptive value one way or another. Thus hair forms of any type could develop in any climatic conditions. There does seem however that pigmentation is subject to adaptive pressures on account of the effect of UV rays. The same may be said for average population heights. The San are small and gracile yet the Dinka are quite tall. The same for nasal forms. Nasal forms of any metric can evolve anywhere and ultimate averages are determined only by the contingencies of the breeding mechanisms within population isolates. If hair forms evolved according to climatic principles then how does one explain male pattern baldness--if the ultimate adaptive value of cranial hair is to offer some sort of protection against UV rays or in tropical regions, cranial cooling? [/QB][/QUOTE]
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