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Genomic Ancestry of North Africans Supports Back-to-Africa Migrations Brenna M. Henn
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[QUOTE]Originally posted by The Explorer: [QB] [QUOTE]Originally posted by the lioness,: I am not informed enough to explain Fst and pi values. Maca-Meyer said that chart shows highest divesity of U6 in Iberians. [/QUOTE]First off, Fst actually estimates differences between two samples rather than internal diversity of samples, while the pi calculation estimates the internal nucleotide diversities of clades. Instead of just parroting what research teams said, it is generally a good idea to have a firm grounding on the science. I looked at the haplogroup distribution in Maca-Meyer et al.'s report, and I found that U6's distribution is actually more diverse in Africa than it is in Iberia. The African distribution covered U6a-U6c, not including the basal U6 clades, while the Iberian clades were mainly restricted to U6a and U6b. The Iberian distribution is therefore a subset of the African distribution. Hence, it's not surprising Maca-Meyer et al. also note as follows: [i]In Europe, U6 lineages have been consistently sampled only in the Iberian Peninsula. It has been mentioned that U6 nucleotide diversity is higher in Iberia than in Africa [12]. This has been confirmed here (Table 3). However, [b]S is greater in West Africa[/b]. Considering the isolation of the different Berber groups we think that, in this case, [b]the latter is a better diversity measure[/b].[/i] [QUOTE] I thought I had seen a U6 frequency chart before that showed Europe with next highest frequency but that may have been an H chart. Are you claiming that U6 is next highest in other Africans after NorthAfricans/Canaries? I couldn't find info.[/QUOTE]I don't see its distribution being higher outside of Africa than in Africa, even when not considering the Maghreb. At least, not going by the source you cited yourself, aka Maca-Meyer et al. [QUOTE]But I think the character of the earlier U does not suggest African origin.[/QUOTE]What is the "earlier U", and what bearing does it have on U6's origin? U6 doesn't descend from the presently identified U clades; I'm not sure you understand that. [QUOTE]Give an opinion instead of trying soley to expose my limits. [/QUOTE]I've been making my viewpoint on U6 fairly known, long before you've joined ES. Any attentive poster, and longstanding enough, would know where I stand on U6 phylogeny by now. Unlike you, I don't simply post excerpts, and leave people to guess what the point was. :D [/QB][/QUOTE]
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