Gene Flow

Gene flow—also called migration—is any movement of genes from one population to another. Gene flow includes lots of different kinds of events, such as pollen being blown to a new destination or people moving to new cities or countries. If genes are carried to a population where those genes previously did not exist, gene flow can be a very important source of genetic variation. In the graphic below, the gene for brown coloration moves from one population to another.

Gene flow in beetle populations

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Gene flow: details

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Spanish translation of Understanding Evolution For Teachers from the Spanish Society of Evolutionary Biology.