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IB Biology SL 1.3.1 Gene mutations Question Bank

Practise IB Biology SL 1.3.1 by defining gene mutation and explaining how nucleotide changes produce new alleles.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Define a gene mutation as a change in the nucleotide sequence of a gene.
  • Identify a type of gene mutation such as substitution, insertion or deletion.
  • Explain how a mutation can introduce a new allele into a population.

D1.3.1—Gene mutations 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 D1.3.1—Gene mutations question 1 — IB Biology SL

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

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