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overdominance

(ō′vər-dŏmə-nəns)
n.
  1. The condition in which a heterozygote has a phenotype that is more pronounced or better adapted than that of either homozygote.
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Related formso′ver•domi•nant adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Examples from the Web for overdominance

Historical Examples

  • According to statistical studies, overdominance by parents decreases the chance of successful marriage.

    The Good Housekeeping Marriage Book

    Various