I just have a question for anyone that would be able to answer it..........  If my mother is O+ and my father is O-    can that make me A- ? I am not sure and I heard that it couldn't but I just needed some confirmation. Thank you for your time.
Steve
 
            
            Steve
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                 no. the genotype for bloodtype O+ and O- is ii
Punnet Square:
i i
i ii ii
i ii ii
basically, NO CHANCE OF A+, A-, B+, B-, AB+, or AB-
 
            
             
                        Punnet Square:
i i
i ii ii
i ii ii
basically, NO CHANCE OF A+, A-, B+, B-, AB+, or AB-
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