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codominance/co·dom·i·nance/ (ko-dom´ĭ-nins) the full expression in a heterozygote of both alleles of a pair with neither influenced by the other, as in a person with blood group AB.codom´inant
A heterozygous condition in which both alleles at a gene locus are fully expressed in the phenotype.
Etymology: L, cum, together with, dominare, to rule
the equal degree of dominance of two alleles or traits fully expressed in a phenotype, as when a person inherits both the IA and IB genes of the ABO blood group and has type AB blood. codominant, adj.