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DNA Analysis Probes the End of Human-Neanderthal Sex
An anonymous reader writes "Modern Europeans may have interbred with Neanderthals as recently as 37,000 years ago, after modern humans with advanced stone tools expanded out of Africa, according to a new study. In an attempt to understand why the Neanderthals are more closely related to people from outside of Africa, researchers from Harvard and the Max Planck Institute estimated that while the last sex between Neanderthals and modern humans may have occurred 37,000 to 86,000 years ago, it is most likely that it occurred 47,000 to 65,000 years ago."
Funny, but Maria is probably as Neanderthal as Arnold. What interests me is that the Neanderthal genes never made it back into Sub-Saharan Africa, which means that some Africans remained mostly separated from non-Africans for a quite a long time. Same goes for Micronesians and Austrailians, who have Denisovan genes that the rest of humanity doesn't have.
And I guess this explains how it is we managed to end up with noticeably tweaked physical features. If Europeans and Mid-East people had been exchanging a lot of genes with Sub-Saharan Africans (for example if there had been a lot of trade between Africa and Europe or if there had been migrations into Africa) you'd expect there to be less difference in skin and eye color and more variation of hair curliness among Africans.
Had there been more trade or immigration to Africa, Africans might look more like African-Americans, who have a mixture of African, European and other ancestry.
If two individuals give fertile descendency, aren't they of the same species?
Welcome to the Species Problem.
tl;dr - It's complicated.
Faster! Faster! Faster would be better!