Ancient African DNA reveals a shift in mate-seeking.
Starting around that time, inherited sets of gene variants became increasingly similar in ancient individuals found in central, eastern and southern regions of sub-Saharan Africa, the researchers report. This suggests that this area was a genetic melting pot, in which hunter-gatherers migrated between the three regions, mating with each other along the way.
“As the African tropics came out of the last ice age, the landscape became full of many small groups of people with diverse local cultural traditions,” Thompson says. Culturally distinct groups tended to seek mates from neighboring groups with whom they had more in common than migrants from distant regions, she suspects.
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