AP BIOLOGY

Detailed explanation-1: -A mother who is blood type O can only pass an O allele to her son or daughter. A father who is blood type AB could pass either an A or a B allele to his son or daughter. This couple could have children of either blood type A (O from mother and A from father) or blood type B (O from mother and B from father).

Detailed explanation-2: -Believe it or not, in this case having a blood type different from either parent is by far the most common result. In most cases, an O parent and an AB parent will have only A or B kids.

Detailed explanation-3: -Usually, an AB parent and an A parent can only have children who are Type A or Type B. One exception is in certain Asian groups. Some of these folks have a rare version of the ABO blood type gene called cis-AB. People with this gene version have an AB blood type but can easily have an O child.

Detailed explanation-4: -If a father’s blood group is o+ and mothers’s is AB+, what would their children be? The genotype of the father or possible genes he could pass on would be O O; the mother, A B. The genotype of the children would be AO & BO.

Detailed explanation-5: -Hence, their child would have either blood group A or B. Therefore, the couple has a 50 percent chance of having blood type A. Therefore, the correct answer is b).