Salient features of theory of Hugo de Vries:
i. Mutations cause evolution.
ii. New species originate due to large mutations.
iii. Evolution is a discontinuous process and not gradual.
iv. Mutations are directionless,
v. Mutations appear suddenly.
vi. Mutations exhibit their effect immediately.
| S. No. |
Darwin’s Theory of Natural Selection |
Vries Theory of Mutation |
| (i) |
He believed that minor variations cause evolution.
Darwinian variations are small and directional. |
He believed that mutation causes evolution. |
| (ii) |
He believed evolution to be gradual. |
He believed sudden mutations caused evolution. |
