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Question 104

Which statements about the rate at which mutations happen are true? Select all that apply.

  1. Ionising radiation increases the rate at which mutations occurCorrect answer
  2. A single exposure to radiation changes every gene in the body
  3. Certain chemicals increase the rate at which mutations occurCorrect answer
  4. Mutations occur only when an outside factor causes them

Explanation

Ionising radiation and some chemicals damage DNA or disturb the way it is copied, so exposure raises the chance that a change is left behind in a cell. That does not make an outside cause necessary, because copying a very long molecule occasionally goes wrong on its own, and it does not make the damage universal within one exposed body.

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Question 104: Which statements about the rate at which mutations happen… · Genetics Basics · Questena