How do we know whether the blood group is positive or negative?
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we can find the blood group by the presence of Rh antigens in blood if these r present they r -ve and in case if absent they r +ve blood group person
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Explanation:
The Rh factor is simply a protein that is found on the covering of the red blood cells. If your red blood cells have this protein, you are Rh positive. If your blood cells don't have this protein, you are Rh negative. Just as everyone inherits ABO genes, every person inherits one Rh factor gene from each parent.
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