If O and positive are both dominant traits than it is possible, but only approximately 25% likely to happen.
The child will be A or B or AB, Rh+ or Rh- . So yes, the child can be A-.
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.
No, an O-group parent cannot have an AB-group child at all.
yes
No, an O-group parent cannot have an AB-group child at all.
for sure
no. her children have to either be A or B
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.
Yes to both.
The child could be A+, AB+, B+, A-, AB-, or B-. That is, any blood type except O positive or O negative.