Zoology - Evolution Question with Solution | TestHub

Hugo de Vries gave his mutation theory on organic evolution while working onOenothera lamarckiana(evening primrose). Hugo de Vries brought forth the idea of mutations – large difference arising suddenly in a population. He said that it is a mutation that causes evolution and not the minor variations (heritable) that Darwin talked about. Mutations are random and directionless while Darwinian variations are small and directional. Evolution for Darwin was gradual while deVries believed mutation caused speciation and hence called it saltation (single-step large mutation).