Wallace effect
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In 1889, A. R. Wallace wrote the book Darwinism, which explained and defended natural selection. In it he proposed the hypothesis that when two populations of a species had diverged beyond a certain point, hybrid offspring would be less fit than either parent form, and at that point natural selection will tend to eliminate the hybrids, contributing to the reproductive isolation of the populations. This idea came to be known as the Wallace effect.
Also see reinforcement.
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