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Multiple Alleles - MultipleAlleles :IA,IB,andi o o

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Multiple Alleles Many genes exist in populations in more than two allelic forms. The ABO blood groups in humans are determined by three alleles:  I A I B , and  i . o Both the  I and  I alleles are dominant to the  allele. o The  I and  I alleles are codominant to each other. Because each individual carries two alleles, there are six possible genotypes and four possible blood types. o Individuals who are  I A I or  I A are type A and have type A carbohydrates on the surface of their red blood cells. o Individuals who are  I B I or  I B are type B and have type B carbohydrates on the surface of their red blood cells. o Individuals who are  I A I are type AB and have both type A and type B carbohydrates on the surface of their red  blood cells. o Individuals who are  ii  are type O and have neither carbohydrate on the surface of their red blood cells. Matching compatible blood groups is critical for blood transfusions because a person produces antibodies against  foreign blood factors.
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