Write notes on Mutation theory of evolution

Explanation

Mutation Theory of Evolution
The mutation theory was put forth by Hugo de Vries based on his work on evening primrose, (i) It states that evolution occurs by sudden large differences in the population, i.e. mutation and not by minor changes as Darwin stated. (ii) The mutation caused speciation and de Vries called it saltation or single step large mutation. (iii) Mutations are random and directionless, while variations were small and directional as per Darwin. (iv) According to Darwin, evolution is slow and continuous process, while de Vries said it is a single-step process, which is due to discontinuous variations.