EVE100_357-384_2pp

EVE100_357-384_2pp - 3/3/10 Phenetics or distance-based...

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3/3/10 1 357 Phenetics or distance-based methods provide one approach for inferring evolutionary relationships Based on the idea that organisms that are more similar share a more recent common ancestor compared to organisms that are less similar All characters may be utilized Relies on the assumption that evolutionary rates are homogeneous across lineages 358 Cladistics – branching patterns can be reconstructed based on shared derived character states, known as synapomorphies (Willi Hennig) Premise – there is only one true tree of life. Therefore, a shared derived character state can only be explained by virtue of inheritance through a common ancestor. In this world view, shared derived character states must be used and monophyletic groups are the only valid groups. Fut. 3.2 monophyletic paraphyletic polyphyletic
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3/3/10 2 359 Reptiles are a paraphyletic group Convergent phenotypic evolution is a common outcome of directional selection. Thus, similarity may not be indicative of homology. 360 Fut. 3.8
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3/3/10 3 361 Fut. 2.5 Note that the presence of feathers unites birds but absence of feathers does not de±ne a group. 362 Classifying characters for a cladistic analysis Ridley
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3/3/10 4 363 Bad inferences can result from use of shared ancestral traits, known as sympleisiomorphies, rather than shared derived character states, Wrong!! 364
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This note was uploaded on 03/29/2010 for the course EVE EVE 100 taught by Professor Davidbegun during the Winter '10 term at UC Davis.

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EVE100_357-384_2pp - 3/3/10 Phenetics or distance-based...

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