Question

DISRUPTIVE NATURAL SELECTION:-
1. Here more number of individuals acquire peripheral character value at both ends of the distribution curve.
2. Nature select extreme phenotypes and eliminate intermediate. Hence two peaks are formed in distribution of traits.
3. This kind of selection is rare.
4. It ensures the effect on the entire genepool of a population, considering all mating types or systems.
EXAMPLE:- It was observed in the different beak size of African seed cracker finches.
The birds have different size of beak and they feed on seeds. The available seeds were of two kinds small and large

Answer 1

1)Disruption.

2) establishing centre

3)Another type of selection, called frequency-dependent selection, favors phenotypes that are either common (positive frequency-dependent selection) or rare (negative frequency-dependent selection).

4) genetic variation