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Question

A man with blood group B marries a woman with blood group A and their first child is having blood group B. What is the genotype of child?

A
IAIB
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B
IAIO
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C
IBIO
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D
IBIB
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Solution

The correct option is C IBIO
The blood group of the man is B. The genotype of the man will be IB IO or IB IB. The woman has the blood group A so, the genotype will be IAIO or IAIA. The first child has blood group B. The gamete IB from the male will combine with IO from the female to give the blood group B. So, the genotype will be IBIO.
Thus, the correct answer is option C.

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