Zoology - Principles of Inheritance and Variation Question with Solution | TestHub

In $\mathrm{ABO}$ blood group system, inheritance of grouping is controlled by a single autosomal gene on chromosome-9 with three major alleles $\mathrm{A},\mathrm{B}$ and $\mathrm{O}({\mathrm{I}}^{\mathrm{A}},{\mathrm{I}}^{\mathrm{B}}$ and ${\mathrm{I}}^{\mathrm{O}})$. The $\mathrm{ABO}$ blood group system has at least 6 genotypes. On the basis of presence or absence of antigens and antibodies, 4 blood groups (phenotypes) have been differentiated, ie, $A,B,AB$ and $O$ blood groups.