A blood type O child would be impossible from this match. An AB parent must give an A allele or a B allele, and both alleles are dominant. If mother is homozygous B (meaning both alleles are B's), and father is AB, child can be either B or AB. If mother is heteroygous B (meaning one B allele and one O allele), and father is AB, the child can be either A, B, or AB.
No. They can have an O positive, an O negative, A B positive, or a B negative child.
yes
o positive
no
No
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.
If mother is heterozygote yes.
I'm not sure how negative or positive is determined, but a B mother and O father can have a B child.
if your child is negative, i would ask for a blood sample from the mailman
no
no
yes.