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In a species, the weight of newborn 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 weights from 2 to 2.5 kg or 4.5 to 5 kg die. Which type of selection process is taking place?

1. Directional selection
2. Stabilising selection
3. Disruptive selection
4. Cyclical selection

Correct answer: Stabilising selection

Solution

The middle weight range has the greatest survival, while both low and high extremes have very poor survival. That means selection is acting against extremes and favoring the average phenotype, which is stabilising selection.

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