If the genotype is IAIB, what will be the type of blood group and why?

If the genotype is I^AI^B, what will be the type of blood group and why?

Very Short Answer

AB blood group, because both alleles are expressed equally (codominance).

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Chapter 5: Principles of Inheritance and Variation - EXERCISES [Page 256]

Chapter 5 Principles of Inheritance and Variation
EXERCISES | Q I. 18. | Page 256