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NEET AIPMT SOLVED PAPER 2000

  • question_answer
                    Drosophila flies with XXY genotype are females, but human beings with such genotype are abnormal males. It shows that:                                                                                                                                                   

    A)                 Y-chromosome is essential for sex determination in Drosophila

    B)                 Y-chromosome is female determinating in Drosophila

    C)                 Y-chromosome is male determining in human beings

    D)                 Y-chromosome has no role in sex determination either in Drosophila or in human beings

    Correct Answer: C

    Solution :

                    In human beings, the presence of a Y-chromosomeis required for the development of a male sex phenotype. X-chromosomes present in any number (XXX, XXXX) in the absence of a Y chromosome gives rise to female. Presence of even a single Y-chromosome confers maleness. In Drosophila, Y chromosome plays no significant role in sex determination. In Drosophila male determiners were localed on autosomes. One X and two autosomes produce male while two X (X, X) and two autosomes produce female.


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