Question

let's say two parents have type ab and type o blood. draw a punnett square to determine the possible genotypes of their child. what is the probability of a child with type ab blood, and why?

Answer 1

Answer: 0% chance of an AB child

Step-by-step explanation:

One parent's genotype is AB, while the other is OO (recessive, could not be AO or BO because then they would be type A or B (dominant))

A B

O AO BO

O AO BO

There is a 50% chance that their child will be AO, and a 50% chance they will be BO. There is a 0% chance that this couple has a child with AB blood. This is because of the parent that is type O. Since they are Type O, they do not have an A or B allele to donate to their child, only an O. Therefore, when crossed with a person who is AB, they can only have kids who are AO or BO.