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why Australian Aborigenes have straight hair
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[QUOTE]Originally posted by xyyman: [QB] How long does it take to de-pigment ? Good question. I haven’t come across any research investigating specifically that issue. I have read about 1 ˝ dozen papers on the issue. The Penn paper that KIK and other keep citing suggest a time about 6-12ky for “selective sweep” to occur?. Again this is another flaw with the study. The change in diet(vit D deficiency) occurred AFTER the Neolithic revolution ie about 6 thousand BC.. Therefore a comfortable conclusion is 2-6000y for de-pigmentation. The Makova studies on South African Bantus and Khoi-San inferred that the Khoi-San has been in the area(low UV) > 30ky and therefore well adjusted in skin tone. The new Bantus are already showing signs of de-pigmenting compared to the Central African Bantus. .These Bantus have been in South Africa about 2ky. When we go to the Americas. The Native Americans entered about 10-12kya., from the north. Whether they entered light is dark is another issue. But currently they skin tone correlates perfectly to the level of UV radiation. So depending on demic diffusion ie migration rate and skin adaption I will calculate adjustment to UV took 3-6Ky. In another study, Harding et al(?), on AA. There were signs that AA are maybe de-pigmenting via the ASIP loci and not SLCA45. In other words although there maybe admixture with Europeans(SLCA45) even within mono-ethnic relationship skin lightening may be occurring(ASIP). “Nature finds a way”. . . . Jurassic Park [/QB][/QUOTE]
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