on what bases blood group are decided
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ABO blood group system, the classification of human blood based on the inherited properties of red blood cells (erythrocytes) as determined by the presence or absence of the antigens A and B, which are carried on the surface of the red cells. Persons may thus have type A, type B, type O, or type AB blood.
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According to blood antigens . If the antigen of blood will be A then it will be A+ or A- , B antigen B+ or B- , if both A and B antigens are present in blood cells then it will be AB+ or AB- it both antigen are absent in blood cells it will be O+ or O-
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