One parent would need to have: type AO, AA, or AB and rh ++ or +- and the other parent would need to have: type BO, BB, or AB and rh ++ or +- A person with AO or AA will have type A blood; a person...
No. O is recessive and must be homozygous to be expressed. If both parents were O, then this would be the only possible cross. OO X OO ------------ Not disagreeing with, but adding on to the above:...