An AB+ and B- couple can't have a child with blood type O. They can have children with blood types A, B, or AB, and can have children with Rh negative or Rh positive blood.
If the mother is A negative, and the father is B positive, they could have children who are A negative, A positive, B negative, B positive, AB negative, AB positive, O negative, or O positive.
Yes.
# yes, if father is + - for RH and mother - - (negative) or + - (positive); the father can generate sons A, B, or AB depending by mother's group.
no
no
o positive
yes
Yes. The father's phenotype is AO+*; the mother's is OO--.
If mother is heterozygote yes.
The mother must be heterozygous b and the father must be both heterozygous b and heterozygous positive.
Yes, if the father is heterogeneous positive.
Given that the mother's DNA is A and the child is A positive, the father's DNA must also contain the A antigen. The father could be A positive, A negative, AB positive, or AB negative.