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notes on classification

notes on classification - derived character vs primitive...

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1: Linnaean taxonomy that has been built up, not responsible for knowing all the yellow ones (subcategories used to classify organisms), 2: overview 3: mammalian family tree (phylogeny=family tree), a construct/tree of evolutionary relationships of different species, old version of tree 4: more new-fashioned version of a phylogeny 5: taxonomy=naming and classifying organisms into hierarchical groupings phylogeny=history of evolution for particular group, lines of evolutionary descent, family tree systematics=study of phylogenies, construction of phylogenies 6. how to construct family trees-- this is a type of family tree showing evolutionary relatedness, blues animals share a common ancestor at branch point, at some point in the past they all shared a common ancestor phenetic=look at overall similarities in group 7. animals currently living are at top of tree, ones at bottom are extinct, ancestral state is the oldest animal so any of its descendants that have a something different is said to have a
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Unformatted text preview: derived character vs. primitive characteristic shared, derived characteristics with respect to most common ancestor for the two top right animals because they both share an orange face which was derived (?) from their ancestor shared, primitive characteristics are shared but primitive because it came from original ancestor derived characteristic such as spots is completely derived because it's new to the species and didn't come from the ancestors this type of tree is a cladogram and nested groupings within are called clades 8. convergence=when animals that are not closely related converge on a similar type of trait, for example both 1 and 3 on top have red eyes but their last common ancestor did not have red eyes, both acquired characteristic independently of one another homologous=similar characteristics by shared ancestors (tend to be primitive but not always) 9. a split off a long time ago, b and c have more recent common ancestor 10. synapomorphy=shared derived...
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