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oogamous

   Also found in: Dictionary/thesaurus, Encyclopedia, Wikipedia 0.03 sec.
o·og·a·mous (-g-ms)
adj.
Characterized by or having small motile male gametes and large nonmotile female gametes.

oogamous [o-og´ah-mus]
1. pertaining to or produced by oogamy.
2. heterogamous.

oogamous
pertaining or relating to or produced by oogamy; heterogamous.


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Therefore, the last common ancestor of these plants is likely to have been oogamous and to have produced a multicellular 'gametophyte'.
A single-celled oogonium (not a multicellular archegonium, as found in embryophytes) surrounds the single egg cell; however, the nonmotile female gamete, and oogamous reproduction, are similar to embryophytes.
 
 
 
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