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nmdcat.online July 14, 2026

In a marine environment, fast-swimming predatory fish easily catch slow-swimming prey fish. Over generations, the average swimming speed of the prey fish population increases. This is a result of:

A. Lamarckian inheritance of acquired muscle mass
B. Directional natural selection favoring faster swimmers
✓
C. Stabilizing selection maintaining average speed
D. Genetic drift reducing speed variation randomly

📝 Explanation

The selective pressure (predation) favors the faster extreme of swimming speeds, causing a directional shift in the average speed of the prey population over time.

📖 Additional Information

  • Lamarckian inheritance of acquired muscle mass
  • Directional natural selection favoring faster swimmers
  • Stabilizing selection maintaining average speed
  • Genetic drift reducing speed variation randomly

The selective pressure (predation) favors the faster extreme of swimming speeds, causing a directional shift in the average speed of the prey population over time.

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