In genetics, describing alleles that both fully express themselves in a heterozygous individual, producing a blended or mixed phenotype.
From co- (together, jointly) + dominant. A 20th-century genetics term created to describe inheritance patterns that don't follow simple dominant-recessive rules.
Human ABO blood types are a perfect example—people with AB blood type show both A and B codominant alleles, creating a third distinct blood type rather than just one dominating.
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