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KVPY Sample Paper KVPY Stream-SX Model Paper-16

  • question_answer
    In human ABO blood group system, there are six possible genotypes but only four phenotypes. An explanation of this is that the ABO blood groups are controlled by

    A) One gene locus with three incompletely dominant (co-dominant) alleles.

    B) One gene locus with two incompletely dominant (co-dominant) alleles and two recessive alleles.

    C) One gene locus with two incompletely dominant (co-dominant) alleles and one recessive allele.

    D) Two unlinked gene loci each with two alleles, one dominant and one recessive.

    Correct Answer: C

    Solution :

    ABO blood groups occur on one gene locus, where \[{{I}^{A}}\] and \[{{I}^{B}}\] are co-dominant, and is the recessive allele. The allele; is expressed only when present in the homozygous condition.


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