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KCET2026BiologyEvolution

According to Hugo De Vries, speciation is due to __________.

Options

  1. AAccumulation of small variations
  2. BIntraspecific breeding
  3. CInterspecific breeding
  4. DSingle-step large mutation

Correct answer

D. Single-step large mutation

Step-by-step solution

According to Hugo de Vries, evolution is caused by sudden, large, and inheritable changes called mutations. He believed that mutations are random and directionless, unlike Darwinian variations which are small and directional. De Vries termed the process of speciation through a single-step large mutation as saltation. Answer: Single-step large mutation

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