the placenta will filter many things
yes its possible
yes
If the mother's genotype is AO, then it is possible that the child can be type O-
B positive
If the mother's genotype is AO, then it is possible that the child can be type O-
No.
yes its possible
It depends. If the mother of the child is A positive as well, the child will be A positive. This is also true if the mother is a type O. It wont be possible if the mother is B positive, since the child will be AB positive (the blood types are codominant).
If mother is heterozygote yes.
Don't see why not - my hubby and I are A+ and A- and son is O+
You answered your own question genius if the mother is O pos and father is A pos then I guess it is POSSIBLE!
Yes, it is possible. Parents who are O positive may have children who are O+ or O-, depending on the parents' genotypes.