The Diversity of Life I. An Overview
The Diversity of Life I. An Overview A. Classifying Organisms
The Diversity of Life I. An Overview A. Classifying Organisms Initially, using a Platonic, typological concept, Linnaeus and others created a nested, hierarchical system.
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.
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.
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
The Diversity of Life I. An Overview A. Classifying Organisms B. Kingdoms
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').
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
The Diversity of Life I. An Overview A. Classifying B. Kingdoms C. Domains
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.
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
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.
The Diversity of Life I. An Overview D. Timeline 4.5 bya: Earth Forms
The Diversity of Life I. An Overview D. Timeline 4.5 bya: Earth Forms 4.0 bya: Oldest Rocks
The Diversity of Life I. An Overview D. Timeline 4.5 bya: Earth Forms 4.0 bya: Oldest Rocks 3.8 bya: Oldest Fossils
The Diversity of Life I. An Overview D. Timeline 4.5 bya: Earth Forms 4.0 bya: Oldest Rocks 3.8 bya: Oldest Fossils Stromatolites - communities of layered 'bacteria'
The Diversity of Life I. An Overview D. Timeline 2.3-2.0 bya: Oxygen in Atmosphere 4.5 bya: Earth Forms 4.0 bya: Oldest Rocks 3.8 bya: Oldest Fossils
The Diversity of Life I. An Overview D. Timeline 2.3-2.0 bya: Oxygen 1.8 bya: first eukaryote 4.5 bya: Earth Forms 4.0 bya: Oldest Rocks 3.8 bya: Oldest Fossils
The Diversity of Life I. An Overview D. Timeline 2.3-2.0 bya: Oxygen 1.8 bya: first eukaryote 0.9 bya: first animals 4.5 bya: Earth Forms 4.0 bya: Oldest Rocks 3.8 bya: Oldest Fossils
The Diversity of Life I. An Overview D. Timeline 2.3-2.0 bya: Oxygen 1.8 bya: first eukaryote 0.9 bya: first animals 0.5 bya: Cambrian 4.5 bya: Earth Forms 4.0 bya: Oldest Rocks 3.8 bya: Oldest Fossils
The Diversity of Life I. An Overview D. Timeline 2.3-2.0 bya: Oxygen 1.8 bya: first eukaryote 0.9 bya: first animals 0.5 bya: Cambrian 0.24 bya:Mesozoic 4.5 bya: Earth Forms 4.0 bya: Oldest Rocks 3.8 bya: Oldest Fossils
The Diversity of Life I. An Overview D. Timeline 2.3-2.0 bya: Oxygen 1.8 bya: first eukaryote 0.9 bya: first animals 0.5 bya: Cambrian 0.24 bya:Mesozoic 0.065 bya:Cenozoic 4.5 bya: Earth Forms 4.0 bya: Oldest Rocks 3.8 bya: Oldest Fossils
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 1.8 bya: first eukaryote 0.9 bya: first animals 0.5 bya: Cambrian 0.24 bya:Mesozoic 0.065 bya:Cenozoic 4.5 bya: Earth Forms 4.0 bya: Oldest Rocks 3.8 bya: Oldest Fossils
The Diversity of Life I. An Overview D. Timeline 5 million to present 2.3-2.0 bya: Oxygen 1.8 bya: first eukaryote 0.9 bya: first animals 0.5 bya: Cambrian 0.24 bya:Mesozoic 0.065 bya:Cenozoic 4.5 bya: Earth Forms 4.0 bya: Oldest Rocks 3.8 bya: Oldest Fossils 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...