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NEET Biology Biotechnology And Its Applications Question Bank Genetic 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 [CBSE PMT 2003]

    A) 25%

    B) 100%

    C) 75%

    D) 50%

    Correct Answer: D

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