Question

explain the theory of Hugo de vries​

Answer 1

Explanation:

Hugo De vries ( 1848- 1935) a Dutch botanist , one of the independent rediscoveries of mendelism, put forward his views regarding that formation of new species in 1901. he also met some of the objections found in Darwin's theory. according to him new species are not formed by continuous variations but by sudden appearance of variations which he named as mutuations. Hugo de Vries stated that mutuations are heritable and persist in successive generations.

Answer 2

=> Hugo de varies much important to the discontinuous variations or saltatory variations. he coined the term mutation for suddenly appearing saltatory by working on Oenothera jamarckiana.

Features:-

I) mutations form the raw material for evolution

ii) they appear suddenly and produce their effect immediately.

iii)mutations are not medium for speciation (formation of new species).

iv) mutations are not small changes. they are large and help in changing the organism's physiology comprehensively.

v) natural selected beneficial mutations and eliminates lethal mutations.

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