4 Multicellular eukaryotes Figure 15.4ArchaeaneonProterozoiceonPhanerozoiceonColonizationof landAnimalsMulticellular eukaryotesSingle-celled eukaryotesAtmospheric oxygenOriginof EarthProkaryotes4.6Figure 15.4 Some key events in the history of life on Earth4321PresentBillions of years ago4
11 Table 16.7 Differences between the domains Bacteria, Archaea, and Eukarya 11
12 Most recent common ancestor of all living things Figure 15.19A1Most recent common ancestor of all living things2Gene transfer between mitochondrial ancestorand ancestor of eukaryotes3Gene transfer between chloroplast ancestorand ancestor of green plantsBacteria321EukaryaFigure 15.19A Two major episodes of horizontal gene transfer in the history of life (dates are uncertain)Archaea4321Billions of years ago12
15 Endosymbiosis theoryMitochondria & chloroplasts were once free living bacteriaengulfed by ancestral eukaryoteEndosymbiontcell that lives within another cell (host)as a partnershipevolutionary advantage for bothone supplies energythe other supplies raw materials & protectionLynn MargulisFrom hypothesis to theory!Paradigm shifting ideas in evolutionary biology.Lynn MargulisU of M, Amherst
16 Evolution of eukaryotes Endosymbiosis theoryEvolution of eukaryotes
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