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heterogamete

heterogamete Biol.
  (ˌhɛtərəʊˈgæmiːt)
  [f. hetero- + gamete.]
  Either of a pair of conjugating gametes that differ in character or form.

1897 Ann. Bot. XI. 120 The stage of Aphanochaete is..the intermediate step between two motile heterogametes and the true sexuality realized in the higher types. 1949 B. B. Mundkur Fungi & Plant Dis. vi. 49 While the gametes are motile isogametes in Synchytrium endobioticum, they are non-motile heterogametes in Olpidiopsis.

Oxford English Dictionary

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