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The Diversity of Life I. An Overview

Delve into the classification of organisms, from Linnaeus to modern biologists, evolution's impact on taxonomy, the complexity of kingdoms and domains, and the timeline of life's evolution on Earth.

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The Diversity of Life I. An Overview

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  1. The Diversity of Life I. An Overview

  2. The Diversity of Life I. An Overview A. Classifying Organisms

  3. The Diversity of Life I. An Overview A. Classifying Organisms Initially, using a Platonic, typological concept, Linnaeus and others created a nested, hierarchical system.

  4. The Diversity of Life I. An Overview A. Classifying Organisms Initially, using a Platonic, typological concept, Linnaeus and others created a nested, hierarchical system. Evolution explained this nested pattern as a consequence of descent from common ancestors.

  5. The Diversity of Life I. An Overview A. Classifying Organisms Initially, using a Platonic, typological concept, Linnaeus and others created a nested, hierarchical system. Evolution explained this nested pattern as a consequence of descent from common ancestors. Modern biologists view the classification system as a means of showing the phylogenetic relationships among groups.

  6. The Diversity of Life I. An Overview A. Classifying Organisms Initially, using a Platonic, typological concept, Linnaeus and others created a nested, hierarchical system. Evolution explained this nested pattern as a consequence of descent from common ancestors. Modern biologists view the classification system as a means of showing the phylogenetic relationships among groups. Genetic relatedness should be the basic for biological classification... Genus Felis Genus Panthera Family Felidae

  7. The Diversity of Life I. An Overview A. Classifying Organisms B. Kingdoms

  8. The Diversity of Life I. An Overview A. Classifying Organisms B. Kingdoms Phylogenetic analysis revealed that the "Monera" were an incredibly diverse group genetically. Also, one subgroup - the Archea, were more similar to Eukaryotes than to the other group of prokaryotes (the 'Eubacteria').

  9. The Diversity of Life I. An Overview A. Classifying Organisms B. Kingdoms Phylogenetic analysis revealed that the "Monera" were an incredibly diverse group genetically. Also, one subgroup - the Archea, were more similar to Eukaryotes than to the other group of prokaryotes (the 'Eubacteria'). This required a new way of looking at the most fundamental groupings of life - and the introduction of a new term: Domains

  10. The Diversity of Life I. An Overview A. Classifying B. Kingdoms C. Domains

  11. The Diversity of Life I. An Overview A. Classifying B. Kingdoms C. Domains Curiously, the very root of life may be invisible to genetic analysis. Bacteria transfer genes by division (to 'offspring'), but they also transfer genes "laterally" to other living bacteria. This makes reconstructing bacterial phylogenies difficult.

  12. The Diversity of Life I. An Overview A. Classifying B. Kingdoms C. Domains Also, early evolution involved bacterial symbioses and gene sharing between hosts and symbionts

  13. The Diversity of Life I. An Overview A. Classifying B. Kingdoms C. Domains So, reconstructing the patterns of relatedness among these ancient life forms is difficult.

  14. The Diversity of Life I. An Overview D. Timeline 4.5 bya: Earth Forms

  15. The Diversity of Life I. An Overview D. Timeline 4.0 bya: Oldest Rocks 4.5 bya: Earth Forms

  16. The Diversity of Life I. An Overview D. Timeline 4.0 bya: Oldest Rocks 3.8 bya: Oldest Fossils 4.5 bya: Earth Forms

  17. The Diversity of Life I. An Overview D. Timeline 4.0 bya: Oldest Rocks 3.8 bya: Oldest Fossils 4.5 bya: Earth Forms Stromatolites - communities of layered 'bacteria'

  18. The Diversity of Life I. An Overview D. Timeline 2.3-2.0 bya: Oxygen in Atmosphere 4.0 bya: Oldest Rocks 3.8 bya: Oldest Fossils 4.5 bya: Earth Forms

  19. The Diversity of Life I. An Overview D. Timeline 2.3-2.0 bya: Oxygen 1.8 bya: first eukaryote 4.0 bya: Oldest Rocks 3.8 bya: Oldest Fossils 4.5 bya: Earth Forms

  20. The Diversity of Life I. An Overview D. Timeline 2.3-2.0 bya: Oxygen 0.9 bya: first animals 1.8 bya: first eukaryote 4.0 bya: Oldest Rocks 3.8 bya: Oldest Fossils 4.5 bya: Earth Forms

  21. The Diversity of Life I. An Overview D. Timeline 2.3-2.0 bya: Oxygen 0.9 bya: first animals 1.8 bya: first eukaryote 0.5 bya: Cambrian 4.0 bya: Oldest Rocks 3.8 bya: Oldest Fossils 4.5 bya: Earth Forms

  22. The Diversity of Life I. An Overview D. Timeline 2.3-2.0 bya: Oxygen 0.9 bya: first animals 1.8 bya: first eukaryote 0.5 bya: Cambrian 0.24 bya:Mesozoic 4.0 bya: Oldest Rocks 3.8 bya: Oldest Fossils 4.5 bya: Earth Forms

  23. The Diversity of Life I. An Overview D. Timeline 2.3-2.0 bya: Oxygen 0.9 bya: first animals 1.8 bya: first eukaryote 0.5 bya: Cambrian 0.24 bya:Mesozoic 0.065 bya:Cenozoic 4.0 bya: Oldest Rocks 3.8 bya: Oldest Fossils 4.5 bya: Earth Forms

  24. The Diversity of Life I. An Overview D. Timeline 4.5 million to present (1/1000th of earth history) 2.3-2.0 bya: Oxygen 0.9 bya: first animals 1.8 bya: first eukaryote 0.5 bya: Cambrian 0.24 bya:Mesozoic 0.065 bya:Cenozoic 4.0 bya: Oldest Rocks 3.8 bya: Oldest Fossils 4.5 bya: Earth Forms

  25. The Diversity of Life I. An Overview D. Timeline 5 million to present 2.3-2.0 bya: Oxygen 0.9 bya: first animals 1.8 bya: first eukaryote 0.5 bya: Cambrian 0.24 bya:Mesozoic 0.065 bya:Cenozoic 4.0 bya: Oldest Rocks 3.8 bya: Oldest Fossils 4.5 bya: Earth Forms for 1/2 of life's history, life was exclusively bacterial.... what were they doing? Spheres, rods, and spirals were all they could come up with?? Let's look...

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