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[QUOTE]Originally posted by xyyman: [QB] Continuing …even the progressive Europeans are hiding stuff. So Europeans had a longer co-existence with Neanderthal but they carry less “ancestry” lol! I never thought of that. Good going Guido! Now they are desperate to “explain” Neanderthal ancestry in Africans. --------------------- Quote: Removal of the SNPs identified as a potential Denisovan contribution to the modern genomes caused no substantial change in the results, and the analysis of f3 statistics [b]did not show any detectable impact of back migration to Africa [/b] upon the SET OF MARKERS WE CONSIDERED. To exclude the possibility that a [b]higher level of African ancestry in the European samples [/b]we considered (perhaps due to back migration into Africa from Southern Europe) is responsible for the observed pattern, we ran additional comparisons of divergence time distributions between sub-Saharan Africans and Europeans with different geographic origins. To do this, we analyzed Basque and English populations from the POPRES dataset [70] and the Finns from the 1000 Genomes Project [71]. The divergence times estimated for these populations are very close to those previously estimated for Europeans[b] (DATA NOT SHOWN);[/b] therefore, it does not seem that the presumably [b]higher level of African admixture in southern than Northern Europeans [/b]may possibly account for our results. These findings show that our estimates reflect to a minimal extent, if any, the effects of potentially confounding factors related with interbreeding with Denisovans [60] or gene flow with other modern humans, after the African expansions Quite to the contrary, here, the[b] Europeans appeared significantly closer to Africans than [/b]Australo-Melanesians, a result which therefore cannot be due to that kind of ascertainment bias. Moreover, our FST estimates are comparable with those obtained by the last survey of the 1000 Genomes Project; when rare variants are excluded (MAF > 0.05). The estimated [b]contribution of Neandertals is less in the European [/b]than in the Asian/Melanesian genomes, despite the[b] long coexistence between Neandertals and Europeans [/b][82]. At present, the standard way to explain this finding is to assume one single, major episode of hybridization in Palestine (or perhaps further north and east [83]) 47K to 6 Thus, this study raises the possibility that the current patterns of human diversity need more complex models to be fully explained. [b]One possibility is that admixture with Neandertals might have occurred BEFORE AMH left Africa [/b][86]. Another is that common ancestry, rather than hybridization, may account for the excess similarity of Eurasians with Neandertals, in the presence of an [b]ancient structuring of populations[/b] [74, 87]. A third possibility is that the apparent traces of Neandertal hybridization in Papua New Guinea may in fact be due to Denisovan admixture. We are not in a position to actually test for these possibilities, but exploring these hypotheses may contribute to a better understanding of the main human dispersal processes and of the relationships between archaic and modern human forms.. ---------- But within their lies the truth comes out. [/QB][/QUOTE]
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