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  • Among the listed options, which combinations exclusively represent pre-zygotic forms of reproductive isolation?   <s

Among the listed options, which combinations exclusively represent pre-zygotic forms of reproductive isolation?

 

1. Hybrid inviability

2. Gametic isolation

3. Zygote mortality

4. Temporal isolation


 

Option: 1

1, 2, and 4
 


Option: 2

2 and 4


Option: 3

Only 4

 


Option: 4

1and 3


Answers (1)

best_answer

Pre-zygotic reproductive isolation refers to barriers that prevent successful fertilization between individuals of different species or populations. These barriers occur before the formation of a zygote, which is the fertilized egg.
Gametic isolation (option 2) is a pre-zygotic form of reproductive isolation where the gametes (sperm and egg) of different species or populations are incompatible, preventing fertilization from taking place.
Temporal isolation (option 4) is another pre-zygotic form of reproductive isolation. It occurs when different species or populations have different breeding times or mating seasons, preventing them from encountering each other and attempting to reproduce.

Option 2, "2 and 4," is the correct answer because it exclusively represents pre-zygotic forms of reproductive isolation, involving both gametic isolation and temporal isolation.

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