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D3.2.6—Phenotypic plasticity

Phenotypic plasticity occurs when the same genotype produces different phenotypes under different environmental conditions in inheritance problems in inheritance problems.

Syllabus
First assessment 2025
Objective
D3.2.6
Level
HL

Exam analysis

Chance of appearing1%of analysed past papers
Latest appearanceNovember 2025
Most common paperPaper1A
Typical marks1

Recent exam appearances

November 2025Paper1A ["HL"] · TZ332[ 1 ]D3.2.6—Phenotypic plasticity
Practice this objective

Coverage 2025–2025 · Updated 16 Jul 2026

Concept essentials

  • One genotype can produce different phenotypes in different environments.
  • Phenotypic plasticity changes expression without changing DNA sequence.
  • Environmental effects can complicate genotype-to-phenotype predictions.
ConceptIB Biology HL