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Husband × Wife IAIB × IAi. Number of genotypes = 4. Number of phenotypes = 3. IAIA and IAi = A, IAIB = AB, IBi = B.

1. IAIA and IAi = A
2. IAIB = AB
3. IBi = B
4. None of the above

Correct answer: None of the above

Solution

In ABO inheritance, IAIA and IAi both produce type A, IAIB produces type AB, and IBi produces type B. Since options A, B, and C are all correct statements, the only choice that fits is that none of the above is the correct answer to the question as framed.

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