IB Biology Topic A3.2: Classification and Cladistics Lessons

This lesson delivers structured, step-by-step lessons that guide students through every part of the IB Biology syllabus for A3.2 Classification and cladistics (HL). These lessons simplify complex ideas like molecular biology, evolutionary mechanisms, and homeostasis, while worked examples show how to approach IB-style questions.

Designed for both HL and SL learners, RevisionDojo lessons ensure students not only understand the theory but also know how to apply it in IB Paper exam situations.

With clear explanations, active learning checks, and a syllabus-first design, RevisionDojo makes revision less overwhelming and more effective.

A3.2.1 Need for classification of organisms (HL)

A3.2.2 Difficulties classifying organisms into the traditional hierarchy of taxa (HL)

A3.2.3 Advantages of classification corresponding to evolutionary relationships (HL)

A3.2.4 Clades as groups of organisms with common ancestry and shared characteristics (HL)

A3.2.5 Gradual accumulation of sequence differences (HL)

A3.2.6 Base sequences of genes or amino acid sequences of proteins (HL)

A3.2.7 Analysing cladograms (HL)

A3.2.8 Using cladistics to investigate evolutionary relationships (HL)

A3.2.9 Classification of all organisms using evidence from rRNA base sequences (HL)

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic A3.2: Classification and Cladistics Lessons

Lessons for A3.2 Classification and cladistics (HL) - IB

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics