[koh-dom-uh-nuh nt] /koʊˈdɒm ə nənt/

Ecology. being one of two or more species that are equally in a biotic community:
a forest in which oak and hickory are codominant.
Genetics. of or relating to two different alleles that are fully expressed in a heterozygous individual.
(genetics) (of genes) having both alleles expressed equally in the phenotype of the organism

also co-dominant, 1926, from co- + dominant.

codominant co·dom·i·nant (kō-dŏm’ə-nənt)
Of or relating to an equal degree of dominance of two genes, both being expressed in the phenotype of the individual.


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