Blood typing is often used as evidence in paternity cases in court. In one case, the mother had blood type B and the child had blood type O. Which of the following blood types could the father NOT have?
A) O
B) A
C) B
D) AB

Question

Quizplus · Accepted Answer

Blood type O is recessive, meaning both parents must contribute an O allele for a child to have blood type O. A parent with blood type AB can only contribute A or B alleles, making it impossible for a child to have blood type O if one parent is AB.

Blood Typing Is Often Used as Evidence in Paternity Cases