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White Europeans speak about black Europeans
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[QUOTE]Originally posted by Elmaestro: [QB] There is no genetic advantage of Haplogroups Xyyman, It's the coding genes that'd carry the "advantages." R1b probably become widespread due to the drop off of Carriers of other haplogroups, or sex biased reproduction. Slc24a5, Slc45a2 & other pigmentation alleles became predominant... chances are a higher % of R1b pops carried these SNPs for pigmentation. A similar thing for African populations, [i][b]fixation[/b][/i] for dark skin alleles follows the Bantu expansion, E1B1a pops were most likely predominantly homozygous for genes like MC1r. ...removal of constraint hypothesis was disproved many times over. And it should go without saying that it can not be relaxation....why? because we have a sudden sweep 6000 years ago in Europe. Like I keep saying... Hipopigmentation to the level of Europeans was not advantageous, & it was no adaption. There's an element of chance that probably came into play (Rees et al), selection was probably limited due to an event which lead to a massive loss of genetic contribution, a bottleneck of some sort. [/QB][/QUOTE]
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