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Ch. 28 The Origins of Eukaryotic Diversity PowerPoint Presentation
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Ch. 28 The Origins of Eukaryotic Diversity

Ch. 28 The Origins of Eukaryotic Diversity

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Ch. 28 The Origins of Eukaryotic Diversity

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  1. Ch. 28 The Origins of Eukaryotic Diversity

  2. Introduction to Protists • Eukaryotes. • Most diverse • Most are unicellular, some colonial and multicellular species. • Simplest eukaryotic organisms. • Many protists are exceedingly complex – the most elaborate of all cells. • Aquatic • Asexual/sexual reproduction

  3. Protists • Aerobic in their metabolism, using mitochondria for cellular respiration. • Phototrophs with chloroplasts. • Heterotrophs that absorb organic materials or ingest larger food particles. • Mixotrophs: combo of photo and heterotrophic nutrition

  4. Early EuK Origin • proK small size, limit space for genes. • Limits metabolic activity • Evolution of ProK: • Multi-cellular proK • Complex communities • Compartmentalization • Endosymbiosis • Mitochiondria • Plastids (chloroplasts) • Produces a chimera

  5. Secondary Endosymbiosis • Diversity of Algae • Endosymbiosis occurs twice

  6. Diplomonadida & Parabasala • No mitochondria • Multiple flagella • Giardia lambia • Trichomonas vaginalis

  7. Euglenozoa • Eugleniods and Kinetoplastids • Single mitochondria • Types • Trypanosoma (African sleeping sickness) • Euglena

  8. Alveolata • Parasitic • Cilia • Types • Dinoflagellates: phytoplankton • Pfiesteria piscicidia: carnivorous, blooms, toxins stuns • Apicomplexans • Plasmodium: Produces sporozoite • Ciliophora • Conjugation

  9. Stramenopila • Heterotrophic/photosynthetic • Oomycota • Diatoms • Golden, Brown Algae (seaweed)

  10. Alteration of Generations • Alteration of haploid/diploid that are multicellular • Sporophyte = diploid individual • Gametophyte = haploid individual • Heteromorphic = sporophyte/gametophyte structurally different • Isomorphic = s/g look alike, differ in chromosome number

  11. Algae • Rhodophyta: red algae • No flagella • Phycobilins (red pigment) in plastids • Chlorophyta: green algae • Green pigment • Lichens • Biflagellated • Many colonial, multicellular

  12. Movement and Feeding • Heterotrophs, symbiotic • Rhizopoda: amoebas • Pseudopodia • Actinopoda: Heliozoans • Axopodia • Foraminifera • Marine • Porous shell

  13. Mycetozoa • Slime Molds • Plasmodium Slime Molds: • Cellular Slime Molds: