Describe various types of premating isolating mechanisms.

1.	Describe various types of premating isolating mechanisms.
Answer» Pre-mating or pre-zygotic isolating mechanisms: i. Habitat isolation: In this isolation, members of a population living in the same region occupy different habitat. Thus, potential mates do not meet. ii. Seasonal isolation: In this isolation, members of a population attain sexual maturity at different times, thus preventing interbreeding. Light coloured moth Dark coloured moth Dark coloured moth Light coloured moth Before industrial revolution After industrial revolution 10 Std. XII Sci.: Perfect Biology ‐ II iii. Ethological isolation: In this isolation, members of two populations have different mating behaviours. This prevents interbreeding. iv. Mechanical isolation: In this isolation, the members of two populations have difference in the structure of reproductive organs. So, interbreeding is not possible.

Answer»

Pre-mating or pre-zygotic isolating mechanisms:

i. Habitat isolation: In this isolation, members of a population living in the same region occupy different habitat. Thus, potential mates do not meet.

ii. Seasonal isolation: In this isolation, members of a population attain sexual maturity at different times, thus preventing interbreeding. Light coloured moth Dark coloured moth Dark coloured moth Light coloured moth Before industrial revolution After industrial revolution 10 Std. XII Sci.: Perfect Biology ‐ II

iii. Ethological isolation: In this isolation, members of two populations have different mating behaviours. This prevents interbreeding.

iv. Mechanical isolation: In this isolation, the members of two populations have difference in the structure of reproductive organs. So, interbreeding is not possible.

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