In a population of mice in the northern US, it was observed that small and large

Question

In a population of mice in the northern US, it was observed that small and large mice thrived in their environment, whereas medium sized mice failed to thrive. What type of natural selection would be expected to occur in this population if medium sized mice continued to fail to thrive in this environment?

Directional selection

Overdominance = Disruptive selection

Underdominance = Stabilizing selection

Underdominance = Disruptive selection

Overdominance = Stabilizing selection

Directional selection

Overdominance = Disruptive selection

Underdominance = Stabilizing selection

Underdominance = Disruptive selection

Overdominance = Stabilizing selection

Explanation / Answer

The correct option is under dominance = Disruptive selection. Disruptive selection is a type of selection in which the traits for the extreme values are chosen over the intermediate trait values. This means, in this case, the medium sized mice will not be selected naturally and the case will come under dominance. This results in the increase in the trait variance and the population is divided into two groups. This condition is also termed as heterozygote disadvantage.

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