incomplete dominance

noun
the appearance in a heterozygote of a trait that is intermediate between either of the trait's homozygous phenotypes.
Also called semidominance.
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American Heritage
Medical Dictionary

incomplete dominance n.
A heterozygous condition in which both alleles at a gene locus are partially expressed and which often produces an intermediate phenotype.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
incomplete dominance   (ĭn'kəm-plēt')  Pronunciation Key 
Genetics The fact or condition of being codominant.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Some books don't use the term incomplete dominance at all.
When an intermediate phenotype occurs and no allele dominates, incomplete dominance results.
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