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Since humans went through many bottlenecks as they migrated out of Africa, meaning that a few people are the ancestors of all Europeans, Asians, etc., I've heard there is more genetic diversity among native Africans. As a result, are there less recessive genetic diseases in this population? If some sort of new plague scavenges the Earth, isn't it then more likely that there might be individuals with immunity in the native African population than any other place?
As each small group of people broke away to found a new region, it took only a sample of the parent population's genetic diversity.