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Question:

In a species, the weight of new-born ranges from 2 to 5 kg. 97% of the newborn with an average weight between 3 to 3.3 kg survive whereas 99% of the infants born with weight from 2 to 2.5 kg or 4.5 to 5 kg die. Which type of selection process is taking place?

Directional Selection

Stabilizing Selection

Disruptive Selection

Cyclical Selection

Solution:

Correct option is B. Stabilizing Selection
The given data shows stabilizing selection as most of the newborns having average weight between 3 to 3.3 kg survive and babies with less and more weight have a low survival rate. So, the correct answer is 'stabilizing selection'