High Quality Content by WIKIPEDIA articles! Allopatric speciation (from the ancient Greek allos, "other" + Greek patrida, "fatherland") or geographic speciation is speciation that occurs when biological populations of the same species become isolated due to geographical changes such as mountain building or social changes such as emigration. The isolated populations then undergo genotypic and/or phenotypic divergence as: (a) they become subjected to different selective pressures, (b) they independently undergo genetic drift, and (c) different mutations arise in the populations` gene pools.
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