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Ancient admixture into Africa from the ancestors of non-Africans
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[QUOTE]Originally posted by One Third African: [QB] [QUOTE]Originally posted by Elmaestro: [qb] [QUOTE]Originally posted by One Third African: [QUOTE]Originally posted by Elmaestro: [qb]Anywho, ....so who's still looking forward to physical Basal Eurasians? Anybody? [/qb][/QUOTE]There is the [URL=https://science.sciencemag.org/content/315/5809/226.abstract]Hofmeyr skull from South Africa[/URL] circa 36 kya. Its features are apparently closer to those of Upper Paleolithic Europeans than to extant southern Africans, so it might represent a population related to BE which drifted far to the south. Back in North Africa where we presume BE emerged, another skeletal specimen of interest is the Nazlet Khater man from the Upper Paleolithic of Egypt. However, I've read mixed claims about its affinities. Some sources say [URL=https://www.academia.edu/12994922/The_position_of_the_Nazlet_Khater_specimen_among_prehistoric_and_modern_African_and_Levantine_populations]it is closer to typical "sub-Saharan" Africans[/URL], but others say [URL=https://pubmed.ncbi.nlm.nih.gov/19144388/]it might be related to Upper Paleolithic Europeans[/URL]. Make of that what you will.[/QUOTE]If I was looking for Basal Eurasian one of the last specimen I'd attribute it to is one that shows morphological affinities to Africans and UP Europeans (those analyzed). Basal Eurasian was specifically characterized as differentiated from both those groups of people. I'll just say it again. You won't find Basal Eurasians. They don't exist. Remember this quote pointed out by Oshun?? [QUOTE][URL=http://www.egyptsearch.com/forums/ultimatebb.cgi?ubb=get_topic;f=8;t=010004;p=1#000041] If these regions are simply reflecting shared ancestry between any African and any Eurasian population, rather than the presence of a Natufian-like genetic leaking across the Green Sahara, then they should be equally present in all African populations and the resulting population split estimates should not be affected by the masking procedure.[/URL] --Lucas Pagini[/QUOTE]It's just Africans, and there probably wasn't some grandiose migration as the OP article suggests, just gradual mixture on the continent, Isolation then regrouping etc, etc. This article literally provided evidence for all Africans having "Basal Eurasian" like Admixture. And somehow we can still treat this component as somehow differentiate from Africans, by even labeling it as such "basal Eurasians" or "Eurasian ancestors". I find it very hard to be objective about the framing of all of this. It's borderline satirical. [/qb][/QUOTE]As far as I can glean, the main line of evidence for this ancestry having anything to do with non-Africans is its descent from a bottleneck. If we find out this bottleneck happened somewhere in northern Africa (possibly, say, as a result of a Saharan dry spell), then so much for that signifying a Eurasian back-migration. If people really insist on differentiating African from non-African ancestry, I would think Neanderthal admixture would be a better metric. Though even that hinges on the assumption that Neanderthals never migrated into North Africa. [/QB][/QUOTE]
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