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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
    Which one of the following statements is correct?

    A) Down's syndrome occurs mostly in the children of very young mothers

    B) A person suffering from Down's syndrome has 47 chromosomes

    C) Down's syndrome is very common and occurs once is every 50 births

    D) Down's syndrome is caused when a sperm with an extra X chromosome fuses with a normal egg

    Correct Answer: B

    Solution :

    A person suffering from Down's syndrome has 47 chromosomes


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