yes, 2 positives can have a negative, but not the other way around. I have a son like that.
No. It is impossible, given those blood types, for the offspring to be O positive.
Yes. The mother would have to have a heterozygous Rh genotype, so that she could pass on an Rh negative allele to her offspring.
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.
With a mother with AB Positive blood type and a father with an O Positive blood type, there are four possibilities for the offspring's blood type. The child of this pairing could have A positive or negative, or B positive or negative type blood.
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--.