IB Biology A3.2 Notes
This page contains our IB Biology notes for A3.2. By reading each one of these notes, you will fully cover the content for IB Biology 'Classification & cladistics'.
Chapters
Loading progress...
Classification
You previously learned about species and the binomial naming system. However, the binomial naming system is only a subpart of a whole system of organism classification. Taxonomy is the study of classifying organisms, which has resulted in this classification system.
It groups organisms with shared ancestors together in tiers called taxa, of which there are eight main ones you need to know:
- Domain
- Kingdom
- Phylum
- Class
- Order
- Family
- Genus
- Species
The sequence of taxa can easily be remembered with the mnemonic Dumb King Phillip Came Over For Good Spaghetti.
As you go down the taxa, they become more specific. Each subsequent taxa will contain fewer species with an increasing number of similar traits.
tibertutor.com
Next Up
You have completed the sub-topic A3.2 notes, covering "Classification & cladistics" for IB Biology - continue with related resources below or explore the full IB Biology course from the IBO.
Other Sub-topic A3.2 resources
Explored IB Biology Notes?
Get stuck into one of our other subjects!
Other subjects' Notes
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