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12th Class Biology Principle Of Inheritance And Variation Question Bank MCQs - Principles of Inheritance and Variation

  • question_answer
    Gamete mother cells of the chromosome 44+XY suffers from non-disjunction at first meiotic division. Identify the set of gametes in which this condition would occur

    A) 22 + XX, 22+YY and 22, 22

    B) 22+XY,22+XY and 22,22

    C) 22+X,22+Y and 22+Y,22

    D) 22 + X, 22 +X and 22+Y, 22+Y

    Correct Answer: B

    Solution :

    [b] Non-disjunction is the condition in which the separation of chromosome does not take place during cell division. In 44+XY gametes, there is non-separation of XY gene. It leads to the formation of sperm having genotypes, 22+XY and 22. In such condition, XY would be inherited together due to non-disjunction of XY-chromosome.


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