Mrs. Wade has type O blood, and her mother has type B blood. Her mother stated that her father has type AB blood. What is the chance that he is her father?

Answer: The chance of he being her father is 0.

Explanation:

The mother with blood type B,

The father with blood type AB,

Mrs Wade the offspring with blood type O.

Possible genotypes for both parents:

Mother is BB or BO,

Father is AB.

Since the offspring is having blood type O, we consider a cross between BO of mother and AB of father.

Mother father

Parents gametes: BO x. AB

Offsprings. AB, AB, AO, BO.

From the cross the genotypes that are possible of carrying O are AO and BO but this cannot be used to say that the baby will have blood type O because the O present in AO and BO is recessive gene.

Also, for the baby to have blood type O, she must have gotten one allele from each parent to have a genotype OO which is not so in this case.

Therefore, the chance that he is her father is 0.