IB Biology A3.2 Definitions

This page contains our IB Biology definitions for A3.2. By learning each one of these definitions, you will fully cover the content for IB Biology 'Classification & cladistics'.

All Topic 3 Sub-topics A3.1: Diversity Of Organisms (HL)A3.1: Further diversity (HL)A3.2: Classification & cladistics B3.1: Gas Exchanges (HL)B3.1: Further gas exchange B3.2: Transport (HL)B3.2: Further transport (HL)B3.3: Muscle & motility C3.1: Body Systems (HL)C3.1: Plant systems C3.2: Defence Against Infectious Disease D3.1: Reproduction (HL)D3.1: Further reproduction D3.2: Monogenic Inheritance (HL)D3.2: Polygenic inheritance D3.3: Homeostasis (HL)D3.3: Further homeostasis

artificial classification

Classification of species on the basis of visual observation

clade

A group of organisms that has evolved from a common ancestor

cladistics

The study of classifying clades

gradual divergence

The positive correlation between the number of differences between two species and the time since they diverged from a common ancestor

natural classification

Classification of species on the basis of genetic similarity

taxonomist

The scientist that studies species classification

Next Up

You have completed the topic 3 definitions for IB Biology - continue with related resources below or explore the full IB Biology course from the IBO.

Explored IB Biology Definitions?

Get stuck into one of our other subjects!

Other subjects' Definitions

Chemistry

Physics

Join 85,000 students, across 130+ countries, in 500+ IB schools. That's half of the IB science graduates worldwide.

Start a 7d free trial