Irene and William are having their first child. Irene knows her blood type is A, but William does not know his blood type. However, William knows that his mother and father were B. Their first child is a boy named Gregory. Gregory has type O blood. Of course, Irene and William do not understand how this happened. You could explain this to them using which of the following choices?

a. B only
b. either B or O
c. O only
d. either AB or
e. A only

Option C

So, for them to be able to produce an O type (genotype OO) child (Gregory), Both Irene and William have one copy each of O trait to be able to give birth to Gregory.

Explanation:

If Irene's bloodtype is A, her genotype could be either AO or AA. Since Williams does not know his bloodtype but knows his parents were both B which could be BO or BB. It is safe to assume that Williams could be a BO if is parents were BO and BB for him to produce a child with O type with Irene.

So, for them to be able to produce an O type (genotype OO) child, each has one copy each of O trait to give birth to Gregory.

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