Actual and Potential Gene Flow in Natural Populations

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Abstract
The morphological constancy of sympatric species may be preserved despite compatibility and hybridization sufficient to allow gene flow so long as the equilibrium of competition is maintained. Such hybridization might be expected to result in selection for greater isolation. On the other hand, the potentiality of gene flow thus preserved might prove advantageous and provide a genotype which could exploit an abrupt change in environment.

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