EEB388H1 Lecture Notes - Laurasiatheria, Xenarthra, Glires
15 Oct 2012
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Document Summary
Finding relationships between organisms via their last common ancestor via shared derived characters synapomorphies: derived by all the taxa but shared with but all the ancestors share it aswell. G. g simpson(he produced classification of mammals) + e mayr : trying to develop theoretical framework for classifications: degree to relatedness: overall similarity, degree that they diverged/dissimilar. Genetic info to one another: utilitarian device classification, most museums use g. g simpson system only problem with system was blending 2 degree. Simpson recognized relationship b/t deer and whales but since genetically he knew they were similar but physically looksed so different didn"t put them together. But the whole point is to show the most recent common ancestor so he did it wrong. We could not figure out genetic relationship because we were basing it on morphological characters appearing and disappearing because we could not do genetic sequencing. Base classification system on relationships of organisms.
