De Vries gave his mutation theory on organic evolution while working on:
De Vries gave his mutation theory on organic evolution while working on:
Pisum sativum
Drosophila melanogaster
Oenothera lamarckiana
Althea rosea.
Solution
Hugo de Vries conducted his experiments on Oenothera Lamarckiana, (Evening Primrose) and found several aberrent types. He suggested that new types of inherited characteristics may appear suddenly without any previous indication of their presence in the race.