BIO NMDCAT Darwinism

nmdcat.online July 14, 2026

In a population of snails, shell color ranges from white to dark brown. Songbirds easily spot and eat white snails on dark soil, while dark snails survive. On light-colored sand, the opposite occurs. What type of selection maintains both colors if both habitats are present?

A. Directional selection

B. Disruptive selection

✓

C. Stabilizing selection

D. Artificial selection

📝 Explanation

Because both extreme phenotypes (white and dark brown) are favored in their respective micro-habitats, while intermediate colors are less fit in both, disruptive selection is at play.

📖 Additional Information

Directional selection
Disruptive selection
Stabilizing selection
Artificial selection

Because both extreme phenotypes (white and dark brown) are favored in their respective micro-habitats, while intermediate colors are less fit in both, disruptive selection is at play.

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