1. In genetics, relating to alleles that are both fully expressed in a heterozygous organism without one masking the other.
Usage: biology; genetics

1. An allele or trait that is expressed equally with another allele in a heterozygous individual.
Usage: biology; genetics

Examples

• In human blood types, the A and B alleles are codominant, so a person with both alleles has type AB blood.
• The codominant alleles for flower color both produce pigment, resulting in a striped petal pattern.
• When two codominant traits are inherited together, both phenotypes appear in the offspring.
• The roan coat color in cattle is an example of codominant inheritance.
• Scientists studied how codominant genes affect the expression of certain proteins in the organism.