PATHOLOGY MCQ
GENETICS AND DISEASE
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
O and AB
|
|
|
O and A
|
|
|
O and B
|
|
|
A and B
|
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: -If one parent has A and another has O, they can either produce a child with A or O blood types.
Detailed explanation-3: -An AB parent can indeed sometimes have an O child. But it is by no means common. In fact it would be fair to say that it is exceedingly rare.
Detailed explanation-4: -If a man is homozygous for the blood group O i.e., genotype will be OO and he marries a female with blood group AB. Then the offspring will have blood group A, B according to the punnet square.