Post Lec 20100907

Post Lec 20100907 - Labs start this week You need to attend...

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1 • Labs start this week! • You need to attend lab to secure your registration • Where is my lab? – go on to myCourses -> my tools -> my grades, under lab room 2 Clicker Exercise • Get out your clickers • Confirm the channel: –Press Go – 41 – Go or CH – 41 - CH • Answer the series of questions. • After each, be sure the green light flashes when you respond to a clicker question G O
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3 Have you registered your clicker on MyCourses? 5% 97% 1. Yes 2. No 4 Pre-lecture vocabulary It is expected that you understand the following basic terms and concepts prior to this lecture. From section 1.2 & ch. 25 •p r o k a r y o t e • eukaryote • unicellular • multicellular • metabolism • photosynthesis • aerobic • anaerobic From section 4.2-4.3 chemical evolution spontaneous generation monomer o l y m e r condensation reaction (polymerization) amino acid nucleotide DNA, RNA (nucleic acid) catalyst
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5 BIOL 111 – Organismal Biology Lecture 2 Origin and evolution of life 7 September 2010 6 Origin and evolution of life lecture outline 1. Origin of life 2. History of life 3. Modern life
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7 Origin and evolution of life 8 Evolution Genetic and resulting phenotypic change (observable property) in populations of organisms from one generation to the next • How do scientists work out evolutionary relationships? – Fossil record – Morphological comparisons – Development – Molecular analyses – Behavior
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9 “Living fossils” – The oldest species brachiopod = 500 myo horseshoe crab = 445 myo Ginkgo biloba = 270 myo coelocanth = 410 myo 10 Morphological comparisons - Why is choking so common in humans? Acanthostega
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11 Genetic analyses our revolutionizing our understanding: DNA analyses indicate that Neanderthals and Humans interbred • Neanderthal DNA extracted from the leg bones (which were ~40,000 yrs old) • 60% of the Neanderthal genome has now been sequenced • Comparisons with human genome done this year, Neanderthal DNA fragments are scattered through genome of humans of non-African ancestry • Genetic analyses are greatly advancing our understanding of evolutionary relationships • Our textbook is already out of date! 12 What is your belief regarding the origin of life on Earth? E x t ra -terrestrial source Ch emi ca l ev olu tion . . S p ont a neou s genera. .. O th er e an io n Un de c i d ed 10% 62% 12% 11% 11% 1. Extra-terrestrial source 2. Chemical evolution on Earth 3. Spontaneous generation 4. Other explanation 5. Undecided
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13 Origin of life on Earth 1. Extraterrestrial source?
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Post Lec 20100907 - Labs start this week You need to attend...

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