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heterogamous het·er·og·a·mous (hět'ə-rŏg'ə-məs)adj. Relating to heterogamy.
Alternation of sexual and parthenogenetic generations, as in the life cycles of some aphids.
A reproductive system that is characterized by the fusion of gametes (called heterogametes) that are dissimilar in size and structure, such as the egg and sperm of animals.