A woman who is blood type A has a child who is blood type O.Which of the following individuals could not be the father of this child?
A) Type A
B) Type B
C) Type AB
D) Type O
E) All of these could be the fether

Question

Quizplus · Accepted Answer

If the mother is blood type A and the child is blood type O, then the father must either be blood type O or blood type A with an "i" allele (which means they are heterozygous for the A allele and produce neither A nor B antigens). Type B fathers are not mutually exclusive as an option in this case, but a type AB father could only pass on either an A or B antigen to the child, meaning the child would be type A or B, not type O. Therefore, a type AB father could not be the father of this child.

A Woman Who Is Blood Type a Has a Child