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nmdcat.online July 14, 2026

In a forest, industrial soot darkens the bark of birch trees. Consequently, dark-colored moths become less visible to predatory birds compared to light-colored moths. This shift in predation pressure results in:

A. Stabilizing selection favoring light moths
B. Directional selection favoring dark moths
✓
C. Disruptive selection favoring intermediate moths
D. Artificial selection favoring mutated moths

📝 Explanation

This is the classic case of industrial melanism (peppered moth). The change in tree bark color causes directional selection, shifting the population curve toward the dark phenotype.

📖 Additional Information

  • Stabilizing selection favoring light moths
  • Directional selection favoring dark moths
  • Disruptive selection favoring intermediate moths
  • Artificial selection favoring mutated moths

This is the classic case of industrial melanism (peppered moth). The change in tree bark color causes directional selection, shifting the population curve toward the dark phenotype.

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