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Question

Human blood type is determined by codominant alleles. There are three different alleles, known as $$\displaystyle { I }^{ A }$$, $$\displaystyle { I }^{ B }$$, and i. The $$\displaystyle { I }^{ A }$$ and $$\displaystyle { I }^{ B }$$ alleles are co-dominant, and the i allele is recessive.
The possible human phenotypes for blood group are type A, type B, type AB, and type O. Type A and B individuals can be either homozygous ($$\displaystyle { I }^{ A }{ I }^{ A }$$ or $$\displaystyle { I }^{ B }{ I }^{ B }$$, respectively), or heterozygous ($$\displaystyle { I }^{ A }i$$ or $$\displaystyle { I }^{ B }i$$, respectively).
A woman with type A blood and a man with type B blood could potentially have offspring with which of the following blood types?


A
Type A
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B
Type B
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C
Type AB
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D
All of the above
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Solution

The correct option is D All of the above
A woman with type A blood and a man with type B blood could potentially have offspring with either type A or B or AB blood. The mother with blood group A and the father with blood group B can have different phenotypes as given in the table. When we cross the different combinations, we can see that all the genotypes like I$$^A$$I$$^B$$, I$$^A$$i, I$$^B$$i, ii can be produced which correspond to the blood types AB, A, B, and O respectively. Hence, the correct answer is the option D.
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Biology

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