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You’re a big, fine theory, but you need to back that thang up Write in complete sentences! Don’t talk during the Catalyst! What is a common ancestor? What is a homologous structure? Which two parts of all animal embryos are homologous? What does this tell us about animal evolution?
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Objectives By the end of today, all SWBAT… Analyze DNA evidence of evolution Analyze fossil evidence of evolution
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Agenda Catalyst Review Homework review DNA evidence for evolution HUMAN evolution (OMG!!!) Fossil evidence for evolution TRANSITIONAL FORM STATIONS! AWESOME! Exit Question
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Evidence: an object or connection that tends to prove or disprove something. In science, all theories must be supported with evidence.
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DNA Key Point #1: DNA supports evolution because the more DNA two organisms have in common, the more closely related they are. All organisms use the same four bases (A, T, G, C) because all organisms evolved from the same original organism!
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Original species New species shares 98% of DNA with original species New species #2 shares 96% of DNA with original species Original species
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CRAZY! Humans share: 30% of their DNA sequence with Daffodils 65% of their DNA sequence with Frogs 90% of their DNA sequence with Lemurs 99% of their DNA sequence with Chimpanzees 99.9% of their DNA sequence with other Humans
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Fossils! Fossils are the remains or imprints of an organism that lived long ago. Preserved tissue, shell or skeleton turned into stone, imprints left in the Earth.
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Comparative Anatomy Scientists can compare the anatomy of different organisms to figure out how closely they are related. Anatomy = body structure
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Fossils Key Point #2: Fossils support evolution in 2 different ways. General Trends Transitional Fossils On the right side of your notes, you should have how all of these provide evidence.
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General Trends The further you dig, the further back in time you are traveling. IMPORTANT: As you dig further, fossils tend to be of more primitive and simple creatures!
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PRACTICE! Which one of these fossils would be older? Which fossil is more complex? If B is an ancient ancestor of A, what do you think fossil C would look like? A B C
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A transitional fossil is the fossil of an organism that has traits in between its ancient ancestors and species that came after it. Transitional Fossils
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Human Evolution Homo habilis H. ergaster H. erectus H. heidelbergensis H. sapiens and H. neanderthalensis
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Side-by-Side
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Transitional fossils are evidence for how a particular species has evolved from its recent ancestors.
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How did fish evolve to become the first amphibians? Transitional fossils show how/when whole groups of organisms came into existence
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Transitional Fossil Stations You have 5 minutes at each station. Take a piece of paper and answer each question in complete sentences. LEARN LEARN LEARN!
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Key Point Wrap-Up Key Point #1: DNA supports evolution because the more DNA two organisms have in common, the more closely related they are. Key Point #2: Fossils support evolution in 2 different ways. General Trends Transitional Fossils
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Exit Questions How do transitional fossils provide evidence for evolution? Species A has 50% of its DNA in common with Species B, and 95% of its DNA in common with Species C. Which species is A more closely related to? How do you know? Write in complete sentences! Don’t talk during the Exit Question!
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