BIO NMDCAT Darwinism

nmdcat.online July 14, 2026

An evolutionary biologist observes that the birth weight of human babies is maintained within a narrow range because very light or very heavy babies have lower survival rates. This is a classic example of:

A. Directional selection

B. Stabilizing selection

✓

C. Disruptive selection

D. Sexual selection

📝 Explanation

Stabilizing selection reduces phenotypic variation by selecting against both extremes (very light and very heavy birth weights), maintaining the intermediate phenotype.

📖 Additional Information

Directional selection
Stabilizing selection
Disruptive selection
Sexual selection

Stabilizing selection reduces phenotypic variation by selecting against both extremes (very light and very heavy birth weights), maintaining the intermediate phenotype.

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