Question

The diagram given below represents the operation of natural selection on different trails. Choose the correct option.

• A. Disurptive
• B. Directional
• C. Stabilising
• D. Stabilising & Directional Both
• E. Directional and Disruptive

Answer 1

Answer: (E)

Directional and Disruptive

Answer 2

The correct answer is option (E): Directional and Disruptive
More individuals acquire worth other than the mean character value as a result of a directional shift brought about by natural selection. As a result of the disruption caused by natural selection, more people gain peripheral character value at both extremities of the distribution curve. When one particular characteristic or phenotype is chosen above another, this is known as directional selection. The allele frequency tends to tilt more in one way due to the selection pressure favoring one characteristic. The trait distribution is such that the graphs have a propensity to lean to one side. When the two extreme qualities are preferred without taking the intermediate feature into account, disruptive/diversifying selection takes place. The pattern of the trait distribution places the higher peaks on the extreme and a lower curve on the middle.