dimorphism

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dimorphism The presence of one or more morphological differences that divide a species into two groups. Many examples come from sexual differences of particular traits, such as types of flowers in dioecious plants. These result from sex-linkage of the genes coding for the particular trait. However, some dimorphisms, such as the aerial or submerged leaves of some aquatic plants (e.g. water crowfoot), may not be sex-linked.

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