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nmdcat.online July 14, 2026

Which of the following statements represents a major limitation or gap in Charles Darwin’s original formulation of the theory of natural selection in 1859?

A. He did not realize that environmental resources are limited.
B. He failed to explain the geological changes of the Earth.
C. He could not explain the precise physical mechanism of inheritance or the source of new variations.
✓
D. He denied the existence of geographical barriers in speciation.

📝 Explanation

While Darwin observed heritable variation, he lacked knowledge of Mendelian genetics, chromosomes, and DNA, and could not explain how traits were passed down or how new genetic variations arose.

📖 Additional Information

  • He did not realize that environmental resources are limited.
  • He failed to explain the geological changes of the Earth.
  • He could not explain the precise physical mechanism of inheritance or the source of new variations.
  • He denied the existence of geographical barriers in speciation.

While Darwin observed heritable variation, he lacked knowledge of Mendelian genetics, chromosomes, and DNA, and could not explain how traits were passed down or how new genetic variations arose.

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