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IB Biology SL D1.3.1 Gene Mutations Questions

Work with exam evidence for DNA sequence changes and compare the base-level patterns of substitution, insertion and deletion in IB Biology SL D1.3.1.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Define a gene mutation as a change in the DNA nucleotide or base sequence.
  • Identify and contrast substitution, insertion, and deletion as changes to bases or nucleotides within a gene sequence.

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Study D1.3.1—Gene mutations conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology SL D1.3.1 Gene Mutations Questions question 1

[Maximum number: 2]

Psammonobiotus balticus belongs to a group of protists (unicellular eukaryotic organisms) that have a shell surrounding most of the cell, which provides shelter from predators. The graph shows the frequency of varying shell lengths in a population of P. balticus.

Figure for Question IB Biology SL D1.3.1 Gene Mutations Questions question 1 — IB Biology SL

Mutations may increase variation within a species. Compare and contrast substitution and insertion mutations.

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