Humans can express blood types A, B, AB, or O. In order for a person to express blood type O, they must inherit the allele for O type blood from both parents. A person would express AB type blood if they inherited the A allele from one parent and the B allele from the other parent. Therefore, blood type in humans demonstrates a
complete dominance
b
codominance
c
incomplete dominance
d
complete dominance and codominance
e
incomplete dominance and codominance