The primary difference between the prezygotic barriers and postzygotic barriers involved in reproductive isolation is that prezygotic barriers

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Prezygotic barriers prevent fertilization from occurring, while postzygotic barriers occur after fertilization and prevent offspring from developing or being reproductively successful. Prezygotic barriers can include behavioral, temporal, mechanical, and ecological factors that prevent successful mating or fertilization from occurring. Postzygotic barriers, on the other hand, can involve a variety of developmental, genetic, or behavioral factors that decrease the fitness of hybrids or prevent them from producing viable offspring.

The Primary Difference Between the Prezygotic Barriers and Postzygotic Barriers