Question

When disruptive selection is operated in a population, ____________

• A. Mean value of phenotype is selected
• B. Less than mean value of phenotype is selected
• C. More than mean value of phenotype is selected
• D. Mean value of phenotype are eliminated

Answer 1

Answer: (D)

Mean value of phenotype are eliminated

During the disruptive selection, the changes in the environment cause the existing phenotype to move away from each other by the accumulation of the variations. The mean value of the existing phenotype is eliminated due to the increase in the genetic variations and the mean phenotype is no longer suited to survive in the changed environmental conditions.

A. Mean value of phenotype is selected in the stabilizing selection.

B. Less than mean value would not be suitable for selection.

C. More than the mean value of phenotype leads to the directional selection.

D. The mean value of phenotype is eliminated in disruptive selection.

Hence, the correct answer is 'Mean value of phenotypes are eliminated'