A woman with blood type O has a child with blood type O.She claims that a man named Ralph is the child's father.Her claim would be proven false if Ralph has blood type: Check all that apply.
A)O
B)A
C)B
D)AB

Question

Quizplus · Accepted Answer

If the child has blood type O and the mother has blood type O, the father must either have blood type O or be heterozygous for blood type A or B (AO, BO). If Ralph has blood type AB, it is not possible for him to be the biological father of a child with blood type O. Therefore, option D is the best choice to prove the claim false.

A Woman with Blood Type O Has a Child with Blood