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NEET AIPMT SOLVED PAPER SCREENING 2010

  • question_answer
    ABO blood groups in humans are controlled by the gene I. It has three alleles \[\text{-}{{\text{I}}^{\text{A}}}\text{,}{{\text{I}}^{\text{B}}}\] and i. Since there are three different alleles, six different genotypes are possible. How many phenotypes can occur?

    A) Three                                   

    B) One                      

    C) Four                      

    D)        Two

    Correct Answer: C

    Solution :

    In ABO blood group system, inheritance of grouping is controlled by a single autosomal gene on chomosome 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, four blood groups (phenotypes) have been differentiated?A, B, AB and O blood groups.


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