When we compare levels of genetic variation in a contemporary African population with that of a contemporary non-African population, we find there is more variation in the African population. The reason we see this pattern is that:

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Non-African populations are the products of founder events, which means that a small group of individuals migrated out of Africa and established a new population elsewhere. This small group had only a fraction of the genetic diversity present in the larger African population, resulting in less genetic variation in non-African populations.

When We Compare Levels of Genetic Variation in a Contemporary