Why does reinforcement involve a strengthening of prezygotic, rather than postzygotic, isolation?
A. The rewards of postzygotic isolation are always much smaller than those of prezygotic isolation.
B. Reinforcement occurs only rarely.
C. Postzygotic isolation has only a minimal evolutionary impact.
D. Alleles that prevent interbreeding are more likely to be inherited by viable, nonhybrid offspring than alleles that permit random mating.
E. Assortative mating is uncommon.
Answer: D. Alleles that prevent interbreeding are more likely to be inherited by viable, nonhybrid offspring than alleles that permit random mating.
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