yes
yes
Yes.
o
Sure.
yes they can
Yes.
Since O blood is recessive and B is dominant, this scenario would be possible
This cross AO X BO, would yield that genotype. This cross, AA X BO, would not yield BO. AO X BB would not do it either. So, I assume only AO ( and, from the info given, BO ) is possible for mom.
No, the expected blood types are only B and O. Yes they can because my mom has a- and my dad has a+ so yes you can have a difference in child and parents blood type but is it likely? No.
No, this is not true. The child has to inherit two type O genes, however. Blood type is inherited as a co-dominant factor. For instance: Mom is A+, but her blood type genes are A and O. Because of the codominant nature of blood types inheritance, her blood is type A. Dad is O-. He has two type O genes. If, during fertilization, an ovum from the mother with type O gene combines with one of Dad's spermatozoa, the child will be type O. If an ovum with type A gene is fertilized, however, the resultant child will have type A blood. Same goes for mom who is A and dad who is B, so long as their genes are A/O and B/O, they can still have a type O child. If mom is A/O and dad is B/B, however, there is no chance the child will have type O. The child could have type B (B/O pairing) or AB, however.
Barack is type AB, so there are several possibilities: Mom A, Dad B Mom B, Dad A Mom AB, Dad A Mom AB, Dad B Mom A, Dad AB Mom B, Dad AB Mom AB, Dad AB
Yes. Type O blood requires that you have two recessive genes, one from each parent. Each of your parents can carry one of these and have a different type of blood. In this case, there is a one in four chances of the child having type O blood.