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In biology terms, migration refers to the movement and exchange of genes from one population to another, which can affect the genetic diversity of the populations.
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Gene Flow: The transfer of genetic variation from one population to another.
Population Isolation: When a group of organisms are separated from exchanging genetic material with other organisms of the same species.
Founder Effect: The loss of genetic variation when a new colony is established by a very small number of individuals from a larger population.