NEET AIPMT SOLVED PAPER MAINS 2010

  • question_answer
    ABO blood grouping is controlled by gene I, which has three alleles and show codominance. There are six genotypes. How many phenotypes in all are possible?                                                          

    A)  Six                        

    B)  Three  

    C)  Four                     

    D)  Five

    Correct Answer: C

    Solution :

    In ABO blood group system, inheritance of grouping is controlled by a single autosomal gene on chromosome-9 with three major alleles A, B and O \[\text{(}{{\text{I}}^{\text{A}}}\text{,}{{\text{I}}^{\text{B}}}\text{and}\,{{\text{I}}^{\text{O}}}\text{)}\] . The 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.


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