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    Question

    Mutations are.................?

    A Rarely useful Correct Answer Incorrect Answer
    B Always useful Correct Answer Incorrect Answer
    C Mostly useful Correct Answer Incorrect Answer
    D Always harmful Correct Answer Incorrect Answer

    Solution

    Mutations are sometimes useful as the altered protein structure and function imparts beneficial phenotype; for example, the same mutation in β-globin gene impart malaria resistance; they are rarely useful. 

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