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IB Biology SL D1.3.1 Gene Mutations Questions

In IB Biology SL D1.3.1, gene mutations are changes to the DNA base sequence. The main types are substitution, insertion, deletion and duplication.

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.

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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