Gene flow:

Genes moving from one population to another

Gene flow (or gene migration) describes the movement of a gene from one population to another, regardless of whether it remains within the same species or is transferred to another species (see horizontal gene transfer). Gene flow has an important role in the genetic variation within a population, as it changes the proportion in which different versions (alleles) of a gene are present. The extent to which gene flow affects a population depends largely on the species' mobility – thus, it is less important for plants than for animals.


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