New research on this topic, recently published in the American Journal of Human Genetics, argues that the Out of Africa expansion was preceded by a significant population turnover from East to West Africa. This event likely homogenized West and East Africans.
This turnover, which may account for up to 90% of the contemporary West African gene pool, increased the affinity between West Africans and Eurasians.
This event better explains the lower bound (~60 thousand years ago) inferred from genetic data for the separation time between Africans and non-Africans.
Artificial intelligence suggests a new narrative for the Out of Africa process
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