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BIO NMDCAT Lamarckism
nmdcat.online July 14, 2026

Concerning the concept of “use and disuse,” what biological outcome did Lamarck propose would occur to an organ that is continuously neglected over generations?

A. It would undergo rapid mutation to find a new function.
B. It would gradually weaken, deteriorate, and eventually disappear.
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C. It would become highly specialized and hyper-functional.
D. It would convert into a homologous structure of a different system.

📝 Explanation

Lamarck postulated that the continuous disuse of an organ leads to its gradual degeneration, reduction in size, and ultimate disappearance (vestigialization), as seen in the limbs of snakes.

📖 Additional Information

  • It would undergo rapid mutation to find a new function.
  • It would gradually weaken, deteriorate, and eventually disappear.
  • It would become highly specialized and hyper-functional.
  • It would convert into a homologous structure of a different system.

Lamarck postulated that the continuous disuse of an organ leads to its gradual degeneration, reduction in size, and ultimate disappearance (vestigialization), as seen in the limbs of snakes.

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