Can a daughter have blood group 0 when her father is b?

Yes, a daughter can have blood group 0 when her father is B. This is because the inheritance of blood groups is determined by the alleles inherited from both parents.

In the ABO blood group system, there are three main alleles: A, B, and O. A person's blood group is determined by the combination of these alleles they inherit from their parents.

If the father has blood group B, it means he has two B alleles (BB). The mother must have at least one O allele (OO or BO) in order for the daughter to have blood group 0.

Therefore, if the mother has blood group 0 (OO) and the father has blood group B (BB), there is a 50% chance that their daughter will have blood group B (BO) and a 50% chance that she will have blood group 0 (OO).