RAJASTHAN PMT Rajasthan - PMT Solved Paper-2007

  • question_answer
    In Drosophila, the sex is determined by

    A)  the ratio of pairs of X-chromosomes to the pairs of amosomes

    B)  whether the egg is fertilized or develops parthenogenetically

    C)  the ratio of number of X-chromosomes to the set of autosomes

    D)  X and Y-chromosomes               

    Correct Answer: C

    Solution :

    Calvin Bridges demonstrated that in Drosophila, the sex is determined by ratio of the number of X-chromosomes to the sets of autosomes. According to balance theory of sex determination, Y-chromosome of Drosophila does not important for the determination of sex.


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