For A+ and O- parents, the child can be either A or O, and either + or -.
They are slightly more likely to be O+ than any other.
Yes.
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 it is possible...
yes
A positive, O positive, A negative, or O negative; all are possible
If mother is heterozygote yes.
No.
yes its possible
Yes it is possible if the mother is A positive or A negative.
yes
Yes, if both parents have genotype AO.
Look at the Grandparents.