The action of ultraviolet radiation on DNA to induce mutation is the
  1. formation of thymine dimers
  2. deletion of base pairs
  3. addition of base pairs
  4. methylation of base pairs

Dear student.

The correct answer is 1. formation of thymine dimers

UV radiation by means of photochemical reactions forms covalent linkages between adjacent thymidine residues. As a result of which process of base pairing will be altered, which will lead to mutation.

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