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NEET Sample Paper NEET Sample Test Paper-38

  • 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 :

     50% of ova will have (n + 1) chromosome which would, on fertilization, yield abnormal zygotes\[(n+1)+(n)=2n+1.\]


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