Mutations: Types and Causes · Zoology

Ionizing radiation causes mutations primarily by:

  1. Base substitution
  2. Formation of thymine dimers
  3. Breakage of DNA strands
  4. Insertion of nucleotides
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Correct answer: Breakage of DNA strands

Ionizing radiation produces free radicals that break DNA strands. These breaks can result in severe chromosomal mutations.

Difficulty: Medium Question 11 of 19

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