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'.
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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.
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