Which statement best contrasts Darwinian variation with the mutations …

Question

Which statement best contrasts Darwinian variation with the mutations described by Hugo de Vries?

Accepted Answer

A. {'text': 'Darwinian variations are small and directional; de Vries mutations are random, directionless and large', 'label': 'A'}

The NCERT chapter contrasts the two explicitly: mutations described by de Vries (from his work on evening primrose) are random, directionless and large enough to cause speciation in a single step (saltation), whereas the heritable variations central to Darwinian evolution are small and gradual.

Answer

{'text': 'Darwinian variations are large and sudden; de Vries mutations are small, gradual and directional', 'label': 'B'}

Answer

{'text': 'Both types of change are equivalent in their size, direction and heritability', 'label': 'C'}

Answer

{'text': 'Darwinian variations are non-heritable while only de Vries mutations are heritable', 'label': 'D'}