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Can O plus mother and B plus father can give A plus son?
If the mother is type A or AB (either positive or negative), they could be father and son. Depending on the mother's blood type, an O- father could have a child who is: A+, A-, B+, B-, O+, or O-.
25% to be B.
Yes. The mother would have to be either B or AB.
B is A's daughter. A is B's father.
A father with the blood type can be b negative can have a child even a son that is A positive. The blood of a child comes from one or the other parent. If the mother is A positive the child can be as well.
The father's blood type can be O, A, or B.
A DNA blood test will confirm whether or not you are indeed the father. Some DNA tests can be done with saliva as well, A child can have either the father's blood type, the mother's blood type, or a combination of the two. For instance, a father with type A+, along with a mother with blood type B-, can have A+. A-. B+, or B-.
The father can be type B or AB.
The mother can be type A or AB. She cannot be type O or B.
B is a daughter
Odd question. A is the father. B is not a son, so B must be a daughter instead.