Reproductive Isolation :- Prezygotic isolation and Postzygoti | Dr. Sajid Ali

Reproductive Isolation :- Prezygotic isolation and Postzygotic isolation

Prevention of inter breeding between the population of two different or closely related species
Reproductive isolation was explained by stebbian
Two types reproductive isolation are
Prezygotic isolation
Postzygotic isolation

1. Prezygotic isolation
Prevention of mating and the formation of zygote
Temporal isolation: Due to difference in breeding seasons of two species
Ecological isolation: Due to different habitats of two species
Behavioral isolation: Due to different sexual or coitus behavior of two species

2. Postzygotic isolation
The organisms mate but no offspring are produced
In viability: Zygote fails to develop
Sterility: Adults are sterile and do not produce gametes
Hybrid Breakdown: Sometimes inter specific mating produces a hybrid, but progeny is weak, abnormal or sterile.