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de Vries gave his mutation theory on organic evolution while working on:

1. Pisum sativum
2. Drosophila melanogaster
3. Oenothera lamarckiana
4. Althea rosea

Correct answer: Oenothera lamarckiana

Solution

Hugo de Vries developed his mutation theory from studies on the evening primrose, where he observed abrupt, heritable variations. That species was Oenothera lamarckiana.

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