Yes they can,
First of all, the chance that they have an 0 child is 50%. It can be A of 0.
The chance however that the child is Rhesus negative is 25%.
So 0,5*0,25= 0,125 = 12,5 % chance the kid is 0-.
RV
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
yes
o positive
no
No
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.