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nmdcat.online July 14, 2026

According to Lamarck’s principle of use and disuse, the long neck of the modern giraffe is a direct result of which of the following?

A. Disuse of the forelimbs leading to compensatory neck growth
B. Constant stretching of the neck to reach higher foliage
✓
C. A genetic mutation in the cervical vertebrae developmental genes
D. Natural selection favoring long-necked variants during droughts

📝 Explanation

Lamarck proposed that the giraffe's ancestors had short necks but stretched them to reach leaves on high branches, leading to a longer neck through "use" which was then inherited.

📖 Additional Information

  • Disuse of the forelimbs leading to compensatory neck growth
  • Constant stretching of the neck to reach higher foliage
  • A genetic mutation in the cervical vertebrae developmental genes
  • Natural selection favoring long-necked variants during droughts

Lamarck proposed that the giraffe's ancestors had short necks but stretched them to reach leaves on high branches, leading to a longer neck through "use" which was then inherited.

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