EEB211_Lecture6_Phylogeny notes

EEB211_Lecture6_Phylogeny notes - Lecture 6 Phylogeny...

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It is the science of trying to establish the relationships (relatedness of species) In phylogeny the classification hierarchy is used (Domain, Kingdom, Phylum, etc…..) In phylogeny, there is never a clear division in classes. Groupings are often made but some species that do not have common ancestors end up in the same grouping, or some species are completely different from others (e.g. birds are reptiles) Main problem in morphological approaches, is that some species undergo convergent evolution (2 species look like one even though they don’t share a common ancestor) (1 st )Some species have important traits (which are weighted by intuition and experience) that can be used to differentiate between species and find the relations of phylogeny. (2 nd ) use of large amount of data (different traits) to swamp out convergent features (3 rd ) look of a few un-weighted shared traits (see slide with classical and 2 other phylogeny stuff) Consensus sequence compares several features (strips of letters? sequence of DNA?) And chooses the one with the fewest differences. Check out the tree method (not exactly sure if it must be known). Textbook: Phenetic Approach a method for constructing a phylogenetic tree by computing
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