Mutations. He was the father of saltation. The big jump idea that organisms could make large morphological changes by beneficial mutations all at once.
Darwin considered evolution to be caused due to : 1)small changes/variations that occured 2)these variations were directed specifically towards adapting to the environment(directional) 3)evolution was a slow process De Vries believed that evolution occured by: 1)large changes that occured 2)these changes were mutations and were stochastic or random, not directional 3)evolution occured in fits and starts and was not a slow ongoing process
Hugo de Vries is known chiefly for suggesting the concept of genes, rediscovering the laws of heredity in the 1890s while unaware of Gregor Mendel's work, for introducing the term "mutation", and for developing a mutation theory of evolution.
Beppie De Vries's birth name is De Vries, Elisabeth..
Rob de Vries's birth name is Abraham de Vries.
Sam de Vries's birth name is Samuel De Vries.
Sherwin Vries was born in 1980.
Edwin de Vries's birth name is Edwin Paul de Vries.
Fabienne de Vries's birth name is Fabienne Monique de Vries.
Erwin de Vries has written: 'Erwin de Vries' -- subject(s): Exhibitions
Marius De Vries's birth name is Marius Van Wyk De Vries.
Marion De Vries was born in 1865.
Herman de vries was born in 1931.