APFIVE 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
Both IA and IB alleles are expressed simultaneously in individuals with type AB blood.
B
The simultaneous presence of A and B antigens in blood type AB is a result of codominance.
C
Codominance results in the equal expression of both alleles in the phenotype.
D
In a codominant relationship, one allele completely masks the other in heterozygous individuals.
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