Allopatric speciation requires

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Allopatric speciation requires complete geographic isolation in order to prevent gene flow and allow for genetic divergence to occur. Without complete isolation, gene flow can occur and populations will remain genetically similar or merge back into one population. Overlapping or abutting distributions would not provide enough isolation for allopatric speciation to occur. Differences in phenology can contribute to reproductive isolation, but are not a requirement for allopatric speciation.

Allopatric Speciation Requires