Codominance in ABO Blood Groups
The table shows genotypes and corresponding phenotypes for the ABO blood group, which exemplifies codominance. All of the following statements about codominance are true EXCEPT:
| Genotype | Phenotype |
|---|---|
| IAIA | Type A |
| IBIB | Type B |
| IAIB | Type AB |
A
Codominance results in the equal expression of both alleles in the phenotype.
B
Both IA and IB alleles are expressed simultaneously in individuals with type AB blood.
C
In a codominant relationship, one allele completely masks the other in heterozygous individuals.
D
The simultaneous presence of A and B antigens in blood type AB is a result of codominance.
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