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Gene Flow as a Homogenizing Force on Allele Frequencies

Drift, founder effects and bottlenecks all push populations apart; migration is the force pushing them back together. Without it the student is left with a model where populations only ever diverge, which produces exactly the wrong intuition about human variation.

Questions this Concept answers

Why does gene flow make allele frequencies in different populations more similar over time?

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11.3: Mutation and Migration

Gene flow is the movement of alleles into and out of a population when individuals or gametes migrate, as when pollen is carried between separated plant populations or young males leave one pride to …