092807_Cladistics

092807_Cladistics - 2. Determine characters of interest,...

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9/28/2007 1 9/28/07 Intro to Organismal Biology Announcements 2 Study guide for Exam 1 : Now posted under “Course Documents” Virtual Office hours : Discussion Board forum now open for questions Today’s class Cladistics How do you build a cladogram? Vertebrate example Class exercise Connecting phylogeny and classification Exam I study tips, questions? (Relevant reading: Ch. 25) 3 Building a phylogeny Patterns of shared unique characteristics ( synapomorphies ) can be mapped onto a tree. Cladogram 4 Building a phylogeny What about the cheetah (does not have retractable claws)? Cladogram 5 Cladogram: a hypothesized phylogeny Outgroup : species closely related to “ingroup”, but less related to any of them than they are to each other 6
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9/28/2007 2 Constructing a cladogram 1. Choose taxa (taxonomic groups)
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Unformatted text preview: 2. Determine characters of interest, which should be: homologous categorical (e.g., has a backbone/doesnt have a backbone; A, G, C or T) 3. Construct a table showing character states for all taxa. 7 Constructing a cladogram 4. Figure out order of evolution for each character 5. Group taxa by synapomorphies 6. Build your tree! 8 Constructing a cladogram 4. Figure out order of evolution for each character 5. Group taxa by synapomorphies 6. Build your tree! 9 Constructing a cladogram 4. Figure out order of evolution for each character 5. Group taxa by synapomorphies 6. Build your tree! 10 Constructing a cladogram 11 Constructing a cladogram Class exercise: Building a shoe cladogram 12...
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092807_Cladistics - 2. Determine characters of interest,...

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