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BCECE Medical BCECE Medical Solved Papers-2001

  • question_answer
    Sex determination ratio in an organism is given by \[\frac{X}{A}=15\], then organism will be:

    A)  male          

    B)  female

    C)  super female   

    D)  intersex

    Correct Answer: C

    Solution :

    In Drosophila the presence of Y-chromosome has been found essential for the fertility of male sex but that has nothing to do with the determination of male sex, here the sex is determined polygenic ally. Ratio of X-chromosomes to autosomes and corresponding sex type In Drosophila melanogaster.
    X chromosomes (X) and sets of autosomes Rato  X/A Sex-type
    IX  2A 0.5 Male
    2X  2A 1.0 Female
    3X  2A 1.5 Metafemale
    4X  3A 1.33 Metafemale
    4X  4A 1.0 Tetraploid female
    3X  3A 1.0 Triploid female
    3X  4A 0.75 Intersex
    2X  3A 0.67 Intersex
    2X  4A 0.5 Tetraploid male
    IX  3A 0.33 Metamale
          


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