lecture_16_phylogenetics_SW_updated

lecture_16_phylogenetics_SW_updated - Midterm 2: - onday,...

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Midterm 2: -Monday, March 16, Exam Facility room 200 12-1PM -roughly 25 questions -Check announcements on Blackboard -My section: Exam covers chapters 15, 16, 2; lectures up to today
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Does Natural Selection Ever act DIRECTLY On Reproductive Isolation? Reinforcement: natural selection to avoid hybridization
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1) How and why do organisms diverge and diversify? 2) How can we explain patterns of variation across species? 3) Can the evolutionary processes of mutation, selection, drift explain how we got millions of diverse species on earth?
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Specia’on via Reproduc’ve Isola’on Allows Organisms to Diverge and Diversify
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Phylogenetic Analysis
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Phylogene’c Analysis: Reconstruc’on of the ‘forensic record± of the History of Specia’on/DiversiFca’on DERIVED characters COMMON ancestor SPECIATION event Node internode
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Why Conduct Phylogene’c Analysis? -Understand history of life -Understand large-scale patterns of evolution -Understand how many times traits have evolved, how fast, under what conditions -Practical: where/when did parasites spread? Which flu strain was the most successful last year?
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Understanding Phylogene’c Trees Human Chimpanzee Gorilla = Chimpanzee Human Gorilla
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Understanding Phylogene’c Trees Human Chimpanzee Gorilla = Chimpanzee Gorilla Human
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Understanding Phylogene’c Trees Human Chimpanzee Gorilla = Chimpanzee Human Gorilla Monophyletic group- complete set of species derived from a common ancestor
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Understanding Phylogene’c Trees Human Chimpanzee Gorilla = Chimpanzee Human Gorilla paraphyletic group- contains some, but not all species derived from a common ancestor
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Understanding Phylogene’c Trees
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Phylogenies as a Forensic Record: Species that share a more recent common ancestor tend to be more similar: descent with modifca’on A B C
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lecture_16_phylogenetics_SW_updated - Midterm 2: - onday,...

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