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(A) Hugo de Vries proposed the mutation theory of evolution in $1901$. He conducted his experiments on the evening primrose, $Oenothera$ $lamarckiana$

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Oenothera lamarckiana

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(A) Hugo de Vries proposed the mutation theory of evolution in $1901$. He conducted his experiments on the evening primrose, $Oenothera$ $lamarckiana$. He observed sudden, heritable changes in the population, which he termed as mutations. He believed that these mutations, rather than small, continuous variations (as proposed by Darwin), were the primary cause of evolution.

Hugo de Vries proposed his mutation theory of organic evolution based on his work on:

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