On his work on Oenothera lamarckiana Hugo -de Vries proposed the theory of
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de Vries proposed the "theory of mutation" based on work he did using Oenothera lamarckiana, the evening primrose. He observed that the original plant would occasionally have offspring with significant phenotypic differences, such as leaf shape and plant sizes. de Vries believed that species differ from one another through abrupt, large changes in traits. Some of the offspring would pass on the new "sport" (mutation) to their progeny; these de Vries were designated as new species.
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