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KEY CONCEPT The current tree of life has three domains.

KEY CONCEPT The current tree of life has three domains. Plantae. Animalia. Classification is always a work in progress. The tree of life shows our most current understanding. New discoveries can lead to changes in classification. Until 1866: only two kingdoms, Animalia and Plantae.

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KEY CONCEPT The current tree of life has three domains.

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  1. KEY CONCEPT The current tree of life has three domains.

  2. Plantae Animalia Classification is always a work in progress. • The tree of life shows our most current understanding. • New discoveries can lead to changes in classification. • Until 1866: only two kingdoms,Animalia and Plantae

  3. Protista Classification is always a work in progress. • The tree of life shows our most current understanding. • New discoveries can lead to changes in classification. • Until 1866: only two kingdoms,Animalia and Plantae Plantae Animalia • 1866: all single-celled organisms moved to kingdom Protista

  4. Plantae Animalia Protista Monera Classification is always a work in progress. • The tree of life shows our most current understanding. • New discoveries can lead to changes in classification. • Until 1866: only two kingdoms,Animalia and Plantae • 1866: all single-celled organisms moved to kingdom Protista • 1938: prokaryotes moved to kingdom Monera

  5. Plantae Animalia Protista Fungi Classification is always a work in progress. • The tree of life shows our most current understanding. • New discoveries can lead to changes in classification. • Until 1866: only two kingdoms,Animalia and Plantae • 1866: all single-celled organisms moved to kingdom Protista • 1938: prokaryotes moved to kingdom Monera • 1959: fungi moved to own kingdom Monera

  6. Plantae Animalia Protista Archea Bacteria Fungi Classification is always a work in progress. • The tree of life shows our most current understanding. • New discoveries can lead to changes in classification. • Until 1866: only two kingdoms,Animalia and Plantae • 1866: all single-celled organisms moved to kingdom Protista • 1938: prokaryotes moved to kingdom Monera • 1959: fungi moved to own kingdom • 1977: kingdom Monerasplit into kingdoms Bacteria and Archaea

  7. The three domains in the tree of life are Bacteria, Archaea, and Eukarya. • Domains are above the kingdom level. • proposed by Carl Woese based on rRNA studies of prokaryotes • domain model more clearly shows prokaryotic diversity

  8. Domain Bacteria includes prokaryotes in the kingdom Bacteria. • one of largest groups on Earth • classified by shape, need for oxygen, and diseases caused

  9. Domain Archaea includes prokaryotes in the kingdom Archaea. • cell walls chemically different from bacteria • differences discovered by studying RNA • known for living in extreme environments

  10. Domain Eukarya includes all eukaryotes. • kingdom Protista • kingdom Plantae • kingdom Fungi • kingdom Animalia

  11. bridge to transfer DNA • Bacteria and archaea can be difficult to classify. • transfer genes among themselves outside of reproduction • blurs the linebetween “species” • more researchneeded tounderstand prokaryotes

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