Irene knows her blood type is A, but William does not know his blood type. However, William knows that his mother and father both had blood type B. Irene and William's first child is a boy with type O blood. Based on this information, William's blood type could beMultiple ChoiceA only.either AB or O.O only.B only.either B or O.
Question
Irene knows her blood type is A, but William does not know his blood type. However, William knows that his mother and father both had blood type B. Irene and William's first child is a boy with type O blood. Based on this information, William's blood type could beMultiple ChoiceA only.either AB or O.O only.B only.either B or O.
Solution
The answer is "either B or O". Here's why:
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William's parents both had type B blood. This means they could either be BB or BO (since B is dominant over O).
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Since their child (William) could potentially carry the O gene, this means at least one of William's parents must have been BO. Therefore, William could be either BO or BB.
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However, William and Irene's child has type O blood. Type O is recessive, meaning both parents must carry the O gene for the child to have type O blood.
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Since Irene has type A blood, she could be either AO or AA. But since their child has type O blood, Irene must be AO.
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Therefore, for their child to have type O blood, William must also carry the O gene. This means William's blood type could be either BO or OO, which simplifies to either B or O.
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