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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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