14. Eukaryotic diversity IIA

14. Eukaryotic diversity IIA - 1 Eukaryotic Diversity II 1....

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Unformatted text preview: 1 Eukaryotic Diversity II 1. Well return the exams today or Friday. 2. Clickers today 3. Friday endosymbiosis HW due. 4. Friday - GAE involves a computer simulations of diffusion. 5. 3-student groups - bring one laptop with downloaded application called Mathematica Player, plus the diffusion simulation from the course website; 4-student groups 2 laptops, if possible 6. Fully charged laptop, watch/timer, calculator, and gmail account C & R 28.1 1970s hypothesis of eukaryote phylogeny Absorption Photosynthesis Ingestion Fungi Molds Algae Plants Protozoa Animals Ancestral eukaryote Protist diversity: 1) Poor coupling between protist phylogeny and nutritional strategy Molds - absorptive, fungus-like protists Algae - photosynthetic, plant-like protists Protozoa - ingestive, animal-like protists Euglena C & R 28.3 Many lineages acquire, then lose plastids Colloquial terms - See F. Fig. 29.26 Protist Diversity Eight major lineages Nutrition often results from convergence, only sometimes from phylogeny 2 Eukaryotic Diversity II C & R 28.1 Eukaryotes evolved as complex assemblages of several organisms due to endosymbiosis. Eukaryotes acquired aerobic respiration and oxygenic photosynthesis from bacterial endosymbionts. Prokaryotes lateral gene transfer Eukaryotes endosymbiosis (with LGT) Unifying features include: nucleus, linear chromosomes, endomembrane system, and complex cytoskeleton. Eukaryotes manifest more organellar, cellular, and multicellular diversity than prokaryotes Eukaryotes originated the sexual stages, i.e., syngamy and meiosis, in life cycles. Protists - paraphyletic group including all eukaryotes except plants, fungi, and animals Plastid evolution - A tale of two metaphors (Darwins Tree of Life vs. Delwiches Babushka Dolls) ht p:/ arts.anu.edu.au F. Fig. 28.7 It is the best of times, and it is the worst of times to be studying plastid evolution - Chuck Delwiche (CBMG) Deep Mysteries of Plastid Evolution red plastids green plastids brown plastids All plastids have chlorophyll a , with different accessory pigments mitochondrial origin 1 plastid with cell wall 1 plastid without cell wall 1 plastid red green Sally Gibbs Plastid evolution - 2 endosymbiosis 1 endosymbiosis - primary plastids with 2 membranes F Fig. 29.17 1 endosymbiosis - mitochondrion 2/sometimes 3 endosymbiosis of plastid origins in many lineages red plastids green plastids brown plastids 3 Eukaryotic Diversity I C & R 28.1 Eukaryotes evolved as complex assemblages of several organisms due to endosymbiosis....
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14. Eukaryotic diversity IIA - 1 Eukaryotic Diversity II 1....

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