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 be
A)B only
B)either B or O
C)O only
D)either AB or O
E)A only

Question

Quizplus · Accepted Answer

Since the child has type O blood, both parents must carry the O allele. William's parents had type B blood, so they could have been BO genetically, allowing William to inherit an O allele. Thus, William could be BO (type B) or OO (type O).

Irene Knows Her Blood Type Is A,but William Does Not