Hi there. I think you have missed some part in the question. If the female has O- blood, if she crosses with a man with A-, It can be either AO - or AA -.
The child can have AO-, OO-.
In the 2nd case, O- mating with O-, the child may have only OO-.
The rest of the query I could not understand and can elaborate if you put up a follow up clarification.
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