Postzygotic barriers

Definition

Postzygotic barriers are mechanisms that occur after the formation of a zygote (fertilized egg) between individuals of different species. These barriers reduce the fitness or reproductive success of hybrid offspring.

Related terms

Reduced hybrid viability: Hybrid offspring may have lower survival rates or overall fitness compared to purebred individuals.

Reduced hybrid fertility: Hybrid offspring may be sterile or have reduced fertility, making it difficult for them to produce viable offspring.

Hybrid breakdown: The first-generation hybrids may be viable and fertile, but subsequent generations might experience reduced viability or fertility.