Q. de Vries gave his mutation theory on organic evolution, while working on :
(a) Oenothera lamarckiana
(b) Drosophila melanogaster
(c) Pisum sativum
(d) Althea rosea
Solution :
Correct option : A Hugo de Vries was a Dutch botanist, one of the independent rediscoveries of Mendelism, put forward his views regarding the formation of new species in 1901. He also met some of the objections found in Darwins theory. According to him, new species are not formed by continuous variations but by sudden appearance of variations, which he named as mutations .Hugo de Vries stated that mutations are heritable and persist in successive generations. He conducted his experiments on Oenothera lamarckiana, (evening primrose) and found several aberrent types.
