Classification — GCSE Biology Revision
Revise Classification for GCSE Biology. Step-by-step explanation, worked examples, common mistakes and exam-style practice aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP.
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Go to Evidence for EvolutionWhat is Classification?
Classification is the organisation of living organisms into groups based on their similarities and evolutionary relationships. Traditionally, this was based on observable characteristics, but modern classification also uses DNA evidence. The Linnaean system uses a hierarchy of taxa: Kingdom, Phylum, Class, Order, Family, Genus, Species.
Board notes: Covered by all major boards (AQA, Edexcel, OCR). The principles of the Linnaean system and the three-domain system are key concepts.
Step-by-step explanationWorked example
Humans are classified as follows: Kingdom - Animalia, Phylum - Chordata, Class - Mammalia, Order - Primates, Family - Hominidae, Genus - *Homo*, Species - *sapiens*. Our binomial name is *Homo sapiens*.
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Common mistakes
- 1Forgetting the order of the Linnaean system. A common mnemonic is 'King Prawn Curry Or Fat Greasy Sausages'.
- 2Confusing the three-domain system with the five-kingdom system. The three-domain system (Archaea, Bacteria, Eukaryota), proposed by Carl Woese, is a more modern classification based on fundamental differences in cell biochemistry.
- 3Thinking that a species name is just one word. The scientific name for a species is always given using the binomial system, consisting of the Genus (with a capital letter) and species (with a lowercase letter), e.g., *Homo sapiens*.
Classification exam questions
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Step-by-step method
Step-by-step explanation
4 steps · Worked method for Classification
Core concept
Classification is the organisation of living organisms into groups based on their similarities and evolutionary relationships. Traditionally, this was based on observable characteristics, but modern c…
Frequently asked questions
Why do scientists classify organisms?
Classification helps us to understand the evolutionary relationships between different organisms, make sense of the vast diversity of life on Earth, and communicate clearly about specific species.
What are the five kingdoms?
The five kingdoms are Animals, Plants, Fungi, Protists (single-celled eukaryotes), and Prokaryotes (bacteria). This is a common classification system, though the three-domain system is now more widely accepted by scientists.