A man with type A blood and a woman with type B blood have a child with type O blood.What are the genotypes of the man and woman?

Question

Quizplus · Accepted Answer

The man must have at least one i allele to pass on to the child, as the child has type O blood, which requires two i alleles. The woman must also have at least one i allele to pass on to the child. This means the genotypes of the man and woman must include at least one i allele. However, since the child has type O blood, neither parent can have an A or B allele. Therefore, the man must have genotype I^A i, and the woman must have genotype I^B i. Choice A is incorrect because it suggests both parents have at least one A or B allele. Choice C is incorrect because it suggests the man has genotype i i, which is not possible given that the child has type O blood. Choice D is incorrect because it suggests the woman has genotype i i, which is not possible given that the child has type O blood. Choice E is incorrect because it suggests both parents have genotype i i, which is not possible given that the child has type O blood.

A Man with Type a Blood and a Woman with Type