alleryIn the human ABO blood group system, a person with blood group AB has the genotype:
AIA IA only (homozygous)
Bii only (homozygous recessive)
CIB IB only (homozygous)
DIA IB (codominance)
Answer & Solution
Correct answer: D. IA IB (codominance)
**ABO is CODOMINANT:** IA + IB both express in AB phenotype (both A and B antigens on RBCs).
IA IA = A; IB IB = B; ii = O; IA IB = AB.
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