Virtually every population outside of Sub-Saharan Africa has Neanderthal and Denisovan DNA between 1-4%. This includes all of Eurasia, all pre-Columbian American populations, Aboriginal Australians, Papuans, etc.
Is there any research about why Sub-Saharan Africa doesn't have Neanderthal DNA?
Is the argument that the tribe of humans from Africa was good at repelling outside invaders, but themselves expanded outwards and assimilated (and then outnumbered) the other populations, or something else?
It just seems a bit bizarre given that all humans elsewhere have relatively similar amounts (but quite a low amount) of Neanderthal DNA, which seems to suggest a reasonable amount of migration, interaction and interbreeding between populations everywhere except Africa.
There were multiple waves out of Africa but Most early anatomical human groups never left Africa as a result, there’s more DNA diversity within the continent than outside Africa
Its confusing because the non-african group grew exponentially while the intra-African continent continued to mature
The anatomically modern humans that left Africa spread rapidly and aggressively across the world basically absorbing and destroying every proto-human group and ecological niche and
now the world is ruled by the aggressive narcissistic chimeral hybrid of human (African) Neanderthal (European proto human) and denisovian (Peking man) that survived the exit snd expansion
It also doesn't hold for the African Diaspora, especially in the Americas (and probably flowing back into Africa as we speak). It's also worth considering that many of the actual traits that Neanderthal-associated genes codes for probably have analogues in the much-wider African genome.
The version of the claim I believed is that Sub-Saharan Africans (especially as of ~2000 years ago) basically don't have any Neanderthal DNA.
Your follow-up doesn't appear to contradict that (of course this wouldn't hold when populations start mixing in modern times and wouldn't have ever held 100%) so I was confused.
However the article does in fact dispute my previous belief:
>The researchers found that African individuals on average had significantly more Neanderthal DNA than previously thought—about 17 megabases (Mb) worth, or 0.3% of their genome.
This is as opposed to 1-4% of genomes for populations outside of Sub-Saharan Africa.
>They also found signs that a handful of Neanderthal genes may have been selected for after they entered Africans' genomes, including genes that boost immune function and protect against ultraviolet radiation.
>The best fit model for where Africans got all this Neanderthal DNA suggests about half of it came when Europeans—who had Neanderthal DNA from previous matings—migrated back to Africa in the past 20,000 years.
"The past 20,000 years" is pretty broad and seemingly includes modern era exchanges, but AFAIK that can't account for selecting Neanderthal genes or for how widespread Neanderthal DNA already is.
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