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A woman with type B blood has two brothers with type O blood and one sister with type A blood. What are their parents' genotypes?

A. Both parents have type A blood.
B. One parent has type B, and the other has type O blood.
C. One parent has type A, and the other has type O blood.
D. Both parents have type B blood.

User Kunal Goel
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1 Answer

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Final answer:

The parents' genotypes can be determined based on the blood types of their children: one parent has type B blood, and the other has type O blood.

Step-by-step explanation:

The parents' genotypes can be determined based on the blood types of their children. A woman with type B blood can be genotype IBi, as type B blood is controlled by the IB allele, and the i allele represents the absence of A or B antigens. Since she has siblings with type O blood and type A blood, her parents must each contribute an i allele, resulting in a genotype of ii for both parents. Therefore, the correct answer is B. One parent has type B, and the other has type O blood.

User Lachelle
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