Hugo de Vries's experimental organism was

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(D) Hugo de Vries conducted his experiments on $Oenothera$ $lamarckiana$ (Evening primrose).He observed that when the plant was self-pollinated and it

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Evening primrose

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(D) Hugo de Vries conducted his experiments on $Oenothera$ $lamarckiana$ (Evening primrose).He observed that when the plant was self-pollinated and its seeds were allowed to grow, the majority of $F_1$ plants were similar to the parents, but a few were significantly different.Based on these experiments, Hugo de Vries proposed the Mutation Theory, suggesting that new types of inherited characters may appear suddenly without any previous indication of their presence in the population.

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