ISS 1-26-2011 - ISS 1-26-2011 Cladistics vs. Evolutionary...

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ISS 1-26-2011 Cladistics vs. Evolutionary Tree A method involved in recognizing relationships between pairs of species on the basis of innovations inherited from their most recent common ancestor. o Expresses closeness of relationships among species based on a common ancestor o It says nothing about ancestry and descent, which are difficult if not impossible to test. Disadvantages of Bipedalism (2 Legs) S-shaped Spine o Slipped disks o Dislocated hips o Wretched Knees Slow on the ground Birthing difficulties Teeth Canines = Chewing up and down No Canines = Grinds Wear patterns indicate the type of diet but not necessarily meat. Tough gritty grassland food vs. softer forest food Evolution (the basics) Evolution is the change of frequency of genes over time Individuals don’t evolve, populations do, and the change in frequency is due to: o Natural Selection Differential reproduction of better suited traits o Subject to random events (e.g. genetic drift)
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ISS 1-26-2011 - ISS 1-26-2011 Cladistics vs. Evolutionary...

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