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
- HL
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.
ConceptIB Biology HL