PATHOLOGY MCQ
GENETICS AND DISEASE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A, B, or O
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A or O
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AB or B
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O only
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Detailed explanation-1: -The woman is blood type A, but we know her genotype must be Ao (not AA) because she has a daughter with blood type O. That means the daughter got an o allele from each parent. That’s why dad must have at least one o. He could have three possible blood types (O, A, or B) with one genotype for each (oo, Ao, or Bo).
Detailed explanation-2: -The genotype of a woman with type A blood whose father has type O blood is AO. This is because the O blood allele is recessive and will only produce the O blood type of both alleles in a person are O. Thus, her father has a genotype of OO.
Detailed explanation-3: -Answer and Explanation: Yes, this man could theoretically be the father of the child. In order for the child to have type O blood, they would need to receive one O allele from each parent. Since the mother has type O blood, she is guaranteed to pass an O allele on to the child.
Detailed explanation-4: -An AB parent can indeed sometimes have an O child. But it is by no means common. In fact it would be fair to say that it is exceedingly rare.