Definition of codominant
1a : forming part of the main canopy of a forest codominant treesb : sharing in the controlling influence of a biotic community
2 : being fully expressed in the heterozygous condition codominant alleles
First Known Use of codominant
Medical Definition of codominant
: being fully expressed in the heterozygous condition the alleles controlling blood groups A and B are codominant since an individual with both alleles belongs to blood group AB
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