What Parental Blood Type Would Not Be Able to Produce

Question

What parental blood type would not be able to produce a child with type O blood?
A) A
B) B
C) AB
D) O

Accepted Answer

Both A and B blood types have the potential to pass on an O allele and produce a child with type O blood. However, type AB individuals have both an A and a B allele, but they do not have an O allele, so they cannot pass it on to their offspring. Therefore, parents with the blood types A, B, or O could potentially produce a child with type O blood, but parents with the blood type AB could not.