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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 offspring produced by an affected mother and a normal father would be affected by this disorder?

    A) 100%               

    B) 75%  

    C) 50%                 

    D) 25%

    Correct Answer: C

    Solution :

    [c] Down's syndrome is the example of autosomal aneuploidy. Here, an extra copy of chromosome 21 occurs. As it is an autosomal disease, the offspring produced from affected mother and normal father should be 50%.


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