Question

Which scientist stated that it is the mutation that cause evolution not the minor variation?

Answer 1

Mutations are random and directionless while Darwin's variations are small and directional. According to Darwin evolution is gradual while Hugo de Vries believed that mutation caused species formation and hence known as saltation (single step large mutation).

Answer 2

Evolution for Darwin was gradual while deVries believed mutation caused speciation and hence called it saltation which would get explained to show clarity.