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Ancient admixture into Africa from the ancestors of non-Africans
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[QUOTE]Originally posted by Ish Geber: [QB] [QUOTE]Originally posted by Doug M: [qb] Why on earth are they so worried about humans migrating back to Africa 70,000 years ago? All the genes those people carried at that time were African anyway. What is the genetic marker or mutation they are using to claim that these genes were "Eurasian"? None of what they are saying is making absolutely any sense and is hypocritical. Eurasian genes stay Eurasian even 50,000 years later, but African genes magically become non African only after a few thousand years....... These clowns are ridiculous. [/qb][/QUOTE]I suspect they are looking of a justification to colonize Africa. I think it should be a requirement in these papers, to explain what the intent and goal is for their "research". Is this serious??? [QUOTE][b]Population sizes and migration rates are modeled as piece-wise constant across 32 exponentially spaced epochs from 133 to 133016 generations in the past, corresponding to 3.8 thousand to 3.8 million years ago (3.8kya–3.8Mya) using a generation time g = 29 years [5].[/b] […] This data set comprises individuals from four African (Yoruban, San, Mbuti, and Biaka) and nine non-African populations (Druze, Han, Karitiana, two Papuan populations, Pathan, Pima, Sardinian, and Yakut). […] Migration Pre-dates East-West Eurasian Divergence To assess whether the inferred back-migration shows variation across the descendants of the OoA event, we repeated the analyses using three representative non-African groups in the SGDP: Han Chinese, French European, and Papuans. Since simulations show that SMCSMC has little power to detect migration predating 70kya, and to exclude Holocene migration, the epoch we use to calculate real-data IMFs comprise the period of peak inferred migration up to the period of diminishing power (30–70kya); we use this epoch for all subsequent analyses. Inferred IMFs are not significantly di↵erent between Han Chinese and European populations in non-Afroasiatic populations (p=0.14, two-tailed paired t-test; Figs. 1h and S6, Table S1), consistent with migration occurring before the European-East Asian split approximately 40kya [20]. [/QUOTE]~Christopher Bernard Cole, Sha Joe Zhu, Iain Mathieson, Kay Prfüer, Gerton Lunter Ancient admixture into Africa from the ancestors of non-Africans [/QB][/QUOTE]
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