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    Question

    Which genetic condition is characterized by an extra

    copy of chromosome 21?
    A Kabuki syndrome Correct Answer Incorrect Answer
    B Klinefelter syndrome Correct Answer Incorrect Answer
    C Down syndrome Correct Answer Incorrect Answer
    D Cockayne syndrome Correct Answer Incorrect Answer

    Solution

    Down syndrome is caused by an abnormality during cell division, resulting in an extra partial or full chromosome 21. This extra genetic material affects physical development and intellectual abilities, making it a distinct genetic condition identifiable by specific facial and physical traits.

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