yes
Yes, if the AB parent contributes a B allele, and the O parent contributes an O allele, then the child will be BO, and will have type B blood.
Yes, they can.
yes
Yes.
Yes, if the father has type B or AB blood.
Yes they can.
No, an O-group parent cannot have an AB-group child at all.
absolutely. as long as one of the parents is positive, the child can be positive. and if one parent is A the other B, the child can be A, B, AB or O depending on the parents' other alleles. so the child can definitely be A or B positive, but also A negative, B negative, AB negative, AB positive, O positive or O negative.
Yes - if both are heterozygotic for RH factor.
Answer Mostly with Parent's groupes.
no
It is possible (by spontaneous mutation, for example) but unlikely.