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Key Points of 18.2 and 18.3 Cladograms & Domains

Key Points of 18.2 and 18.3 Cladograms & Domains. A cladogram show how species and higher taxa are related to one another by showing how evolutionary lines, or linages evolved and branched off from common ancestors over time. See page 517. How are domains and kingdoms defined?.

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Key Points of 18.2 and 18.3 Cladograms & Domains

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  1. Key Points of 18.2 and 18.3Cladograms & Domains • A cladogram show how species and higher taxa are related to one another by showing how evolutionary lines, or linages evolved and branched off from common ancestors over time. • See page 517

  2. How are domains and kingdoms defined? • Scientists use genetic similarities to group organisms and the following characteristics: • Cell type (prokaryotic or eukaryotic) • Cell walls (present or lacking) • Body type (unicellular or multicellular) • Mode of nutrition (autotrophic or heterotrophic)

  3. Kingdoms and Domains Kingdoms Domains • 1. Eubacteria Bacteria • 2. Archaebacteria Archaea • 3. Protista • 4. Plantae • 5. Fungi Eukarya • 6. Animalia

  4. Domain Bacteria • Bacteria are prokaryotes that have strong cell walls and unique genetic systems. • They are the most abundant on Earth and found in almost every environment.

  5. Domain Archaea • Archaea are prokaryotes with chemically unique cell walls and membranes and unique genetic system. • Many are extremophiles, which means they can live in extreme environments like hot springs where others can’t survive.

  6. Domain Eukarya • Eukaryotes are made up of cells that have a nucleus and multiple chromosomes. Most have life cycles with sexual reproduction.

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