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KEY CONCEPT The current tree of life has three domains.

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Presentation on theme: "KEY CONCEPT The current tree of life has three domains."— Presentation transcript:

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

2 Classification is always a work in progress.
New discoveries can lead to changes in classification. Until 1866: only two kingdoms, Animalia and Plantae Animalia Plantae

3 Plantae Animalia 1866: all single-celled organisms moved to kingdom Protista Protista

4 Animalia Protista Plantae 1938: prokaryotes moved to kingdom Monera Monera

5 Protista Plantae Animalia Fungi 1959: fungi moved to own kingdom Monera

6 Animalia Protista Fungi Plantae Archea Bacteria 1977: kingdom Monera split 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. -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 known for living in extreme environments

10 Domain Eukarya includes all eukaryotes.
kingdom Protista

11 kingdom Protista kingdom Plantae

12 . kingdom Protista kingdom Plantae kingdom Fungi

13 . kingdom Protista kingdom Plantae kingdom Fungi kingdom Animalia

14 Bacteria and archaea can be difficult to classify.
transfer genes among themselves outside of reproduction blurs the line between “species” bridge to transfer DNA

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