If blood group of mother & child is B negative,what would be that of father?

Answer 1

there are manye different kinds of blood types within the bloood type categories.

B, A, AB, and O are the ones you think of but within those there are BB, BO, AA, AO, AB, OO, and then there are negatives and positives. it deppends on what type of blood your B- child has .... BB- or BO- ... that means the father could be BO, AO, OO and then with the negative and positive again.

Answer 2

The father's could be anything, but he is at least recessive for both B and RH neg.