IV - 257:232) Giardia- "intermediate...

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IV. Viruses, Viroids, Prions - Small, but what are they? Viruses Viroids Prions Lecture 3: EUKARYOTES: CELLULAR DIVERSITY OUTLINE I. History -- Geological History <<>> Biological History Age of Earth 4.5 billion years radioisotopic dating of meteorites formed during formation of solar system Earliest Common Ancestor 3.5-4 billion years formation of solid crust vs. observation of oldest fossils Oldest Prokaryotic Fossils 3.5 billion years possible cyanobacteria bacteria (autotrophic - photosynthetic). Western Austrailia (Fig 24.1) Oldest Eukaryotic Fossils 2.1 billion years possible eukarytic algae, Michigan (Han & Runnegar, 1992, Science
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Unformatted text preview: 257:232) Giardia- &quot;intermediate form&quot; two nuclei, no mitochondria Multicellular Eukaryotes 1-1.2 billion years projected from on DNA sequence analysis Cambrian &quot;Explosion&quot; (Animals) 500 million years Burgess Shale Fossils Many of current animal phyla (echinoderms, annelids, arthropods, chordates). appearance of skeletons poss. in response to predation. Summary of animal evolution: Fig. 29.1. Summary of chordate evolution: Fig. 30.6. Origins of Plants from green algae 460 million years Fossil Record Summary of Plant evolution: Fig. 27.3. Oldest Vertebrates 500 million years jawless, fishlike...
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IV - 257:232) Giardia- &amp;amp;quot;intermediate...

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