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nmdcat.online July 14, 2026

If we apply Lamarck’s theory to the evolution of flightless birds like the ostrich, what would be the proposed mechanism for their loss of flight?

A. Predators caught all the flying ostriches, leaving only the runners.
B. Ostriches stopped using their wings for flight in a land environment rich in food, causing the wings to gradually degenerate over generations.
✓
C. A mutation in the feather-forming gene prevented flight.
D. The atmospheric density changed, making flight impossible for large birds.

📝 Explanation

Under Lamarckism, the disuse of wings because of terrestrial lifestyle and abundant ground-level resources led to the degeneration of wings over generations.

📖 Additional Information

  • Predators caught all the flying ostriches, leaving only the runners.
  • Ostriches stopped using their wings for flight in a land environment rich in food, causing the wings to gradually degenerate over generations.
  • A mutation in the feather-forming gene prevented flight.
  • The atmospheric density changed, making flight impossible for large birds.

Under Lamarckism, the disuse of wings because of terrestrial lifestyle and abundant ground-level resources led to the degeneration of wings over generations.

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