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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
    Down's syndrome is caused by an extra copy of chromosome number 21. What percentage of offsprings produced by an affected mother and normal father would be affected by this disorder?

    A) 75%

    B) 50%

    C) 25%

    D) 100%

    Correct Answer: B

    Solution :

    50%


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