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NEET UG BIOLOGY MCQ: PRINCIPLE OF INHERITANCE AND VARIATION

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A woman is married for the second time. Her first husband was ABO blood type A, and her child by that marriage was type O. Her new husband is type B and their child is type AB.
What is the women’s ABO genotype and blood type?

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Correct option: A

{\mathrm{I}^\mathrm{A}}{\mathrm{I}^\mathrm{O}};\mathrm{Blood type A}

Option A (

{\mathrm{I}^\mathrm{A}}{\mathrm{I}^\mathrm{O}};\mathrm{Blood type A}

) is correct because the woman must have an

I^O

allele to produce a child with blood type O with her first husband, who has blood type A.

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