Classification

• Classification

  Organising Living Organisms into Groups
• Traditional classification system

  1. Organisms classified by characteristics

  2. Divided into kingdoms

  3. Subdivided into phylum, class, order, family, genus, species
• Levels of classification

  • Kingdom
  • Phylum
  • Class
  • Order
  • Family
  • Genus
  • Species
• Three-domain system proposal

  1. Developed knowledge of biochemical processes

  2. Improved microscopes

  3. New models of classification proposed
• Carl Woese proposed the three-domain system


  1990
• Three domains

  • ARCHAEA
  • BACTERIA
  • EUKARYOTA
• ARCHAEA

  Organisms in this domain are primitive bacteria, often found in extreme places
• BACTERIA


  This domain contains true bacteria like E. coli and Staphylococcus
• EUKARYOTA


  This domain includes fungi, plants, animals, and protists
• Binomial system

  1. Every organism given a two-part Latin name

  2. First part refers to genus

  3. Second part refers to species