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R-V88 from where…really ?– new study
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[QUOTE]Originally posted by capra: [QB] You probably know this, Tukuler, but anyway, admixture f3 is basically looking whether allele frequencies of the target population at each SNP are [i]in between[/i] the allele frequencies at that SNP for each reference population. The logic is straightforward, two populations mix, the resulting population is going to have allele frequencies in between its two parents'. The closer the mix is to 50-50, the more distinctive the parent populations were from each other, the closer the reference populations are to the actual parent populations, and the less drift the admixed population has experienced after the admixture occurred, the stronger the signal. So the magnitude of the f stat depends on several things, but you can see why you'd get a strong signal in this case. Africans and Eurasians are very distinct due to Out-of-Africa bottleneck, so even Papuans and Ust' Ishim give a modest signal. Amhara have probably had a pretty decent population size throughout their history so not intensely drifted, Toubou maybe less so but at least they aren't some tiny band of Ice Age foragers. Amhara are close to 50-50 and Toubou are something like 70-30. It's basically ideal conditions to detect the admixture with f3. [/QB][/QUOTE]
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