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A3.2.3 (HL)—Advantages of evolutionary classification

Evolutionary classification groups organisms by common ancestry, making relationships more predictive than groupings based only on appearance or convenience alone.

Syllabus
First assessment 2025
Objective
A3.2.3
Level
HL

Exam analysis

Chance of appearing2%of analysed past papers
Latest appearanceMay 2025
Most common paperPaper1B
Typical marks4–8

Common command terms

  • Explain

Scoring notes

Common mistake
Using analogous appearance as evidence for close ancestry when molecular evidence contradicts it.

Recent exam appearances

May 2025Paper2 ["HL"] · TZ29(c)[ 8 ]A3.2.3 (HL)—Advantages of evolutionary classification
May 2025Paper1B ["HL"] · TZ12(c)[ 4 ]A3.2.3 (HL)—Advantages of evolutionary classification
Practice this objective

Coverage 2025–2025 · Updated 15 Jul 2026

Concept essentials

  • Natural classification aims to match evolutionary relationships.
  • DNA and protein sequences can reveal ancestry that morphology hides.
  • Species with more similar sequences are usually more closely related.
  • Classification can change when new evidence shows a different ancestry.
  • Evolutionary groupings make biological predictions more reliable.
ConceptIB Biology HL