If a homozygous blood type B father and a blood type O mother produce a child, what is the probability that the child will have blood type B?

100%

Explanation:

Father Genotype: BB

Mother Genotype: OO

One allele will come from the father and one from the mother. Based on the parents' genotypes, any child will take the B allele from the father and an O allele from the mother, so it will have the genotype: BO

O is a recessive allele so the child will always have blood type B.