In ABO genotypes, what genotype represents blood type A?

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The genotype that corresponds to blood type A includes I^AI^A and also I^Ai. The reason this is correct lies in the inheritance of ABO blood group alleles. Blood type A can be expressed in two genetic forms: homozygous (I^AI^A), where both alleles are A, or heterozygous (I^Ai), where one allele is A and the other allele is O. This results in the expression of A antigen on the surface of red blood cells.

The presence of the A allele (I^A) allows for the synthesis of A antigens, leading to the classification of blood type A. In contrast, the other options represent different blood types. I^BI^B represents blood type B, which manifests when both alleles are B. I^AI^B denotes blood type AB, where both A and B antigens are expressed. ii corresponds to blood type O, where no A or B antigens are present, as individuals with this genotype have two O alleles.

Understanding the genetics behind the ABO blood group system is crucial for predicting blood type inheritance and for compatibility in blood transfusions and organ transplants.

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