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In ABO blood grouping, the I^A and I^B alleles are:
AIdentical alleles
BCo-dominant when both are present — both A and B antigens are produced
CIncompletely dominant (giving an intermediate antigen)
DRecessive to i
Answer & Solution
Correct answer: B. Co-dominant when both are present — both A and B antigens are produced
**I^A and I^B are co-dominant**: when both are present (genotype I^A I^B), **both A and B sugars** are produced on the red-cell surface → blood group **AB**. Both alleles are dominant over i.
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