Mechanism of organic evolution proposed by Hugo de Vries is based upon

Mutations as proposed by Hugo de Vries are

Hugo de Vries stressed on

Hugo de Vries stressed on

Hugo de Vries studied mutations in

Hugo de Vries studied mutations in

Mutation theory to explain mechanism of evolution was given by Hugo de Vries and he experimented on the :

Mutation theory to explain mechanism of evolution was given by Hugo de Vries and he experimented on the :

What are the main points of theory of mutations proposed by Hugo de Vries or Darwin's theory of natural selection.

Hugo de Vries' contribution is