Changes in the gene pool of a population when genes transfer from neighboring populations.
Populations are not static: they are always changing and adapting to the environment where they live.
The genetic content of all populations, except those that live in total isolation, is strongly affected by migration of individuals to and from other groups of the same species.
How it Works:
The effect that migration produces is a change in the gene pool of both populations: the frequency of alleles is affected.
One example is what happens to those populations of chimpanzees living in natural reserves. When females reach breeding age, they migrate to a neighboring community where the males welcome them. The gene pools of both populations, the one receiving the female and the one losing the female, change.