Question

Newborn human babies with lesser body weight are prone to infections. Heavier babies are difficult to deliver through the narrow pelvic passage of human mothers and may not survive. Babies with normal body weight have a better chance of survival and can be delivered normally.What kind of selection is exhibited in this case?

a. Stabilizing selection
b. Directional selection
c. Disruptive selection

Answer 1

I strongly believe the first one is the correct answer.

Answer 2

The answer is (A) stabilizing selection. Stabilizing selection favors the average in a population. In this case, babies that are born at a normal body weight, or an average between the two extremes of underweight and large, tend to have more favorable outcomes.