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nmdcat.online July 14, 2026

According to Darwinism, what is the primary mechanism of speciation (the formation of new species)?

A. A single organism undergoing a massive, sudden physical transformation.
B. The gradual accumulation of distinct adaptive variations in geographically isolated populations over long periods.
✓
C. The direct hybridization of two completely unrelated phyla.
D. The rapid extinction of all male members of a population.

📝 Explanation

Speciation occurs gradually as populations diverge genetically and phenotypically in response to different selective pressures, eventually leading to reproductive isolation.

📖 Additional Information

  • A single organism undergoing a massive, sudden physical transformation.
  • The gradual accumulation of distinct adaptive variations in geographically isolated populations over long periods.
  • The direct hybridization of two completely unrelated phyla.
  • The rapid extinction of all male members of a population.

Speciation occurs gradually as populations diverge genetically and phenotypically in response to different selective pressures, eventually leading to reproductive isolation.

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