Question

Required information For each of the questions in this series, determine which reproductive barrier each situation describes. Then, determine if the reproductive barrier is a form of prezygotic or postzygotic reproductive isolation. Click on the box in the table that matches both criteria. For example, if you think the situation describes behavioral isolation, and you think behavioral isolation is a postzygotic reproductive barrier, then your answer should appear as below: Prezygotic barrier Postzygotic barrier Habitat isolation Temporal isolation Behavioral isolation Mechanical isolation HALLANDI LLLLLLII Gametic isolation Hybrid inviability Hybrid infertility Hybrid breakdown

Answer 1

Answer :

Prezygotic or premating isolating mechanisms are those that prevent contact between the species when they are reproductively active or which prevent the union of gametes after mating. It may be caused because of the following reasons such as habitat isolations (Ecological isolation), seasonal isolation (temporal isolation), Ethological or behavioural isolation and mechanical isolation.

Post zygotic isolation mechanisms are those which prevent the growth of hybrid individuals after fertilisation has occurred or which reduce the fertility or viability of the F1 hybrids. They are caused by the following methods such as, gametic mortality, zygotic mortality, hybrid inviability, F2 breakdown etc.,

Pre-zygotic Pre-zygotic Habitat Isolation Temporal isolation Behavioral isolation * Mechanical isolation Gametic isolation * Hybrid in viability Hybrid in fertility Hybrid break down Habitat isolation is also called as ecological isolation and * Temporal isolation is also called as seasonal isolation