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Mzab: Sensitive Ancestry Segment Detection
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[QUOTE]Originally posted by alTakruri: [QB] A European-[b]related[/b] population isn't necessarily a European population. Let me develop it further via Henn's STRUCTURE skyline as applied to Price. You will see I have no doubts about Price's conclusion. Price already told us Mzabis can't be a linear combination of only European and African ancestry. He was looking for those two components to the exclusion of other components. Look at Henn's STRUCTURE skyline for Algeria at K=2 level. K is the number of postulated ancestral populations. In this case Yoruba vs Basque. See the SSA-related and European-related components are roughly the same as Price's HAPMIX results, 22% and 78%. But understanding Mzabis aren't composed bilinearly we'd expect to see other populations arise when allowing for more than two postulated ancestral population components. Here's Henn's STRUCTURE skyline for Algeria with my added text comments right of the skylines. My text synthesizes Price, Henn, and others for an overview of my interpretation of the data. [IMG]http://img651.imageshack.us/img651/7669/hennprice.png[/IMG] Thus at K=4 we see SSA-related breaks down to Maasai and Yoruba while the European-related component splits into "Berbers" and Basque. Berber is an ancestry and language group that developed [i]in situ[/i] in NW Africa with genetic features showing up more in South Europe than in Africa south of 14° north, so seen as European-related instead of SSA-related. When K=6 presumed ancestral populations the bulk of the SSA related component is like East African baNtu genetics with only a smattering of genetic matter found in Nilo-Saharan or Benue-Congo speakers. At K=6 Qataris, Afro-Asiatic speaking SW Asians, emerge out from the European-related component. Finally, assuming 8 ancestral components to Algeria, a further and distinctive Tunisia "Berber" signature (European-related) and Bulala Nilo-Saharan trait (SSA-related) appear. Notice this refined level clearly shows Algeria is predominantly "Berber" with substantial SW Asian and European elements and some diverse SSA elements. European-related elements (which include Africans of Tunisia and Algeria are the greater percentage but 6 of the 8 postulated ancestral populations are African. "Berbers" are native North Africans with considerable South European and SW Asian admixture which is no new news and what I've always said they were here on ES. I've explained this now to my best ability Ask me to expand or clarify where you don't understand what I write. Now please flesh out your gut level statement about Mzabi foreigness with facts and research. [/QB][/QUOTE]
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