GCSE Combined Science (AQA)

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The Three-Domain System

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Inheritance, Variation and Evolution Classification of Living Organisms

The Three-Domain System

2:22 Developing Classification Systems
Spec 4.6.4
Previous Development of Classification Next Evolutionary Trees
  • The three domain system is a new classification system developed by Carl Woese in the 1970s.
  • The system was developed through an increased understanding of cell biochemistry and reproduction.
  • Organisms are classified into three domains: Archaea, Bacteria, and Eukarya.
  • Each domain is further classified into kingdoms.
  • The domain Archaea consists of primitive bacteria, often referred to as extremophiles, which survive in extreme conditions.
  • The domain Bacteria consists of true bacteria, grouped under the kingdom U bacteria.
  • The domain Eukarya (referred to as U carota in the transcript) includes organisms with a cell nucleus and is divided into four kingdoms: plants, animals, protists, and fungi.
  • Students need to be familiar with the features of each kingdom as part of their exam preparation.

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