2/2/09 Notes - 2/2/09 notes Same trait will be either...

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2/2/09 notes Same trait will be either advanced or primitive, depending on the context E.g hair o Derived trait for mammals o Primitive trait for order rodentary carnivora Homologous characters arise from the same character in common ancestor Horse leg Human hand Bird wing Bat wing o Must specify homlologous as “what” o All are homologous as limbs o All arose from limb of fish o BUT wings of birds are NOT homologous as wings Arose from diff. ancestors Bats : evolved from non-flying mammals Birds: evolved from repitles (dino) Cladistic phylogeny: based on shared derived characteristics: synapomorphies: shared apomorphic character. Homoplastic: similarity due to any cause other than common ancestry o many result from convergent evolution o not helpful in terms of creating phylogenies
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Subphylum: Craniata (vertebrata) show chordate characteristics o pleisomorphic or primitive traits traits unique to craniates- synamorphies o apomorphic or derived traits 1. braincase 2. enlarged 3 part brain 3. complex sense organs (optic, otic, olfactory), cephalization- specialized head region
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This note was uploaded on 02/14/2009 for the course ZOL 328 taught by Professor Hill during the Spring '08 term at Michigan State University.

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2/2/09 Notes - 2/2/09 notes Same trait will be either...

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