Babies can be B or O.Cannot say + or -
ab
Blood type A/B
Providing you mean your father has B+, and mother A-, you can be O+, O-, A+, A-, B+, B-, AB+ and AB-, ie. Any blood group.
Yes
Yes, a mother with negative and a father with O positive can have a baby with B positive. If they do, the mother must have blood type B or AB.
B positive
25% to be B.
Yes, this is possible the alleles for B-type are (I^B i ) or (I^B I^B ) for a perent to be O which alleles is (ii) the child should be (I^B i ) and in this way the child got the (i) from father, and I^B from mother.
B+
yeah its possible.
If the father is homozygous for the B blood group, giving him the BB blood genotype, and the mother's genotype is AB (the only genotype for the AB blood group), then their offspring could have either the AB or B blood groups. If the father is heterozygous for the B blood group, giving him the BO genotype, then their offspring could have the AB, A, or B blood groups. However, they could not produce an offspring with the O blood group.
If the mother is A, and the father is A, then the child will only have A antigens and will thus be blood type A. If father or mother are AB, then the child can end up with AB, A, or B blood type. http://en.wikipedia.org/wiki/Blood_type