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  5. Principle Of Inheritance And Variation

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

  • question_answer
    In Down's syndrome, karyotyping has shown that the disorder is associated with trisomy of chromosome number 21 usually due to

    A) Addition of extra chromosome during mitosis of the zygote

    B) Non-disjunction during egg-cell formation

    C) Non-disjunction during sperm-cell formation

    D) Non-disjunction during formation of egg cells and sperm-cells

    Correct Answer: A

    Solution :

    Addition of extra chromosome during mitosis of the zygote


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