Biologists divide mechanisms of reproductive isolation into:

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Biologists divide mechanisms of reproductive isolation into prezygotic and postzygotic categories. Prezygotic mechanisms prevent the formation of a viable zygote, such as through differences in mating behaviors or physical barriers. Postzygotic mechanisms occur after fertilization and prevent the development of a viable offspring, such as through hybrid inviability or infertility. Geographic isolation is not a mechanism of reproductive isolation, but rather a geographic barrier that can facilitate the evolution of reproductive isolation. Similarly, sexual isolation is not a major mechanism, but is rather a component of prezygotic isolation.

Biologists Divide Mechanisms of Reproductive Isolation Into