In human blood group inheritance
(a) I^A and I^B are codominant
(b) I^A and I^B are dominant over i
(c) I^A is dominant over I^B

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a and c only

a only

b only

a and b only

answer is D.

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Detailed Solution

The alleles I^A and I^B produce a slightly different form of the sugar while allele i does not produce any sugar. I^A and I^Bare completely dominant over
i, in other words when I^Aand i are present only I^Aexpresses (because i does not produce any sugar), and when I^Band i are present I^B expresses. But when I^A and I^B are present together they both express their own types of sugars: this is because of co-dominance.

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