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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
    Mongoloid syndrome or Mongolian Idiocy is due to

    A) 21 pairs normal, 22 and 23 extra chromosomes

    B) 22 pairs are normal, one chromosome has trisomy

    C) 24 pairs normal and one extra chromosome

    D) 22 pairs of normal chromosomes with one X chromosome

    Correct Answer: B

    Solution :

    22 pairs are normal, one chromosome has trisomy


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