If a mother has O negative and the father has O positive what does the son have
one of them
Same as the Moter
it will definatly be O but youll have to get a test to be certain if it is + or -.
It depends on your genetics in the whole family. The son can get their grandparent's blood type or whatever. It is unpredictable, and only a blood test will determine the blood type.
i do not know