overdominance

[ ō′vər-dŏmə-nəns ]

n.

The condition in which a heterozygote has a phenotype that is more pronounced or better adapted than that of either homozygote.

Related forms

o′ver•domi•nant adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

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