A mother of blood type A gives birth to a child with blood type O. Which of the following could NOT be the blood type of the father?
A) A
B) B
C) O
D) AB
E) Any of these is a possible blood type of the father.

Question

Quizplus · Accepted Answer

A child with blood type O must inherit an O allele from each parent. A mother with blood type A can have genotype AO, so the father must have at least one O allele. A father with blood type AB cannot have an O allele, so he cannot be the father.

A Mother of Blood Type a Gives Birth to a Child