Classification

Key words

  • Classification

    • placing living things into groups according to their shared similarities

  • Taxonomy

    • the study of differences between species

    • differences can be used to classify species into groups

    • similar species go in the same group

  • Phylogeny

    • the study of how closely related species are based on evolutionary relationships

    • can be represented as an evolutionary tree

Classificationtaxonomy ranking

Kingdoms

kingdom classification

  • there are now 6 kingdoms

    • Prokaryotes have been divided:

      • Eubacteria

        • true bacteria

      • Archaebacteria

        • ancient bacteria

6 kingdom classification6 kingdom classification

Comparing organisms

  • as organisms evolve their DNA proteins change

  • comparing similarities in DNA and proteins of different organisms allow us to see which are more closely related

  • Shared DNA

    • the percentage difference in coding DNA can be used to determine evolutionary history

Cytochrome C

  • highly conserved protein across eukaryotic species

  • vital for respiration

  • the more similar the protein is the more closely related the species are

  • cytochrome c

3 domain, 6 kingdom classification system

3D 6Kkingdom table