The table below lists human blood group genotypes and phenotypes HUMAN BLOOD GROUPS
Phenotype
A
Genotype
JAJA, AI
BIB, Bi
Ајв
B
AB
O
Why is the AB phenotype a result of codominance?
Neither allele is expressed in the phenotype.
Both alleles are equally expressed in the phenotype.
One allele masks expression of the other during expression of the phenotype.
Both alleles blend together to form an intermediate phenotype during expression