Blood Typing

Blood Typing Human Blood comes in a variety of genetically determined blood groups. Knowing a person’s blood group is critical If a medical procedure is done and the wrong blood is used, things could become fatal. Multiple genes are responsible for blood groups (ABO) Single gene for the Rh blood group

Codominance Equal dominance human ABO blood groups 3 version A, B, i A & B alleles are codominant both A & B alleles are dominant over i allele the genes code for different sugars on the surface of red blood cells “name tag” of red blood cell

Genetics of Blood type A A A or A i B BB or B i AB O i i pheno-type genotype antigen on RBC antibodies in blood donation status A A A or A i type A antigens on surface of RBC anti-B antibodies __ B BB or B i type B antigens on surface of RBC anti-A antibodies AB both type A & type B antigens on surface of RBC no antibodies universal recipient O i i no antigens on surface of RBC anti-A & anti-B antibodies universal donor

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