D1.3.5—Randomness in mutation
Mutations occur randomly with respect to need or advantage, although mutation rate can vary with mutagens, repair and DNA context.
- Syllabus
- First assessment 2025
- Objective
- D1.3.5
- Level
- SL
Exam analysis
Chance of appearing1%of analysed past papers
Latest appearanceMay 2025
Most common paperPaper1A
Typical marks1
Recent exam appearances
May 2025Paper1A ["SL"] · TZ38[ 1 ]D1.3.5—Randomness in mutation
Practice this objective
Coverage 2025–2025 · Updated 16 Jul 2026
Concept essentials
- Mutations are not directed by an organism’s needs.
- External factors can increase mutation frequency without making mutations purposeful.
- Mutation rate may vary across sequences and conditions.
- Natural selection acts on mutation-generated variation after it arises.