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D4.1.14 (HL)—Hardy-Weinberg conditions

Hardy-Weinberg equilibrium requires no selection, mutation, migration, genetic drift or non-random mating in a large population in evolving populations in evolving populations.

Syllabus
First assessment 2025
Objective
D4.1.14
Level
HL

Exam analysis

Chance of appearing6%of analysed past papers
Latest appearanceMay 2025
Most common paperPaper3
Typical marks1–2

Common command terms

  • State
  • Identify

Recent exam appearances

May 2025Paper1A ["HL"] · TZ339[ 1 ]D4.1.14 (HL)—Hardy-Weinberg conditions
May 2015Paper3 ["HL"] · TZ12(c)(i)[ 2 ]D4.1.14 (HL)—Hardy-Weinberg conditions
May 2014Paper3 ["HL"] · TZ12(b)(ii)[ 1 ]D4.1.14 (HL)—Hardy-Weinberg conditions
November 2013Paper3 ["HL"] · TZ02(d)[ 1 ]D4.1.14 (HL)—Hardy-Weinberg conditions
May 2013Paper3 ["HL"] · TZ1D2(a)[ 2 ]D4.1.14 (HL)—Hardy-Weinberg conditions
Practice this objective

Coverage 2012–2025 · Updated 16 Jul 2026

Concept essentials

  • Hardy-Weinberg equilibrium is a null model for no evolution.
  • Random mating and a large population help maintain expected genotype frequencies.
  • Selection, mutation, migration and drift can disrupt equilibrium.
ConceptIB Biology HL