…from Human Genome.
"According to a team of researchers at the University of California, Davis, only a very small percentage of Neanderthal DNA is present in the genomes of modern humans because, after interbreeding, natural selection removed large numbers of ‘bad' Neanderthal gene variants.
When anatomically modern Homo sapiens left Africa about 50,000 to 80,000 years ago and spread through Europe and Asia, they interbred with Neanderthals.
The first hybrid offspring would have been, on average, a 50/50 mix of modern human and Neanderthal genes, and could then have themselves bred with modern humans, Neanderthals or other hybrids.
Thanks to DNA samples retrieved from a number of fossils, we have enough data on the Neanderthal genome to identify their genes among ours…"
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