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IB Biology HL 1.3.5 Randomness, mutation rate and selection Question Bank

Practise IB Biology HL 1.3.5 by analysing random mutation, mutagenic frequency and the distinction between mutation and selection.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Analyse how mutation can be random in outcome while its frequency changes with exposure.
  • Distinguish mutation generation from selection of variants in an evolving population.
  • Evaluate a claim about directed adaptation using genetic and environmental evidence.

D1.3.5—Randomness in mutation question 1

[Maximum number: 1]

What is a feature of mutations?

A

They occur randomly.

B

They only occur in germ cells.

C

The frequency cannot be increased by external factors.

D

They only occur in certain base sequences of the genome.

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