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Download Evolution as a Statistical Process
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Evolution as a Statistical Process Evolution Maintains Statistical equilibrium; this equilibrium can be disrupted by external influence/control Natural Selection Random pairings of traits Ecosystem survival rules Each paired trait has a different survival probability If Ecosystem remains largely unchanged, end result is a distribution of most probable values http://homework.uoregon.edu:8080/chimer a/worksheet.jnlp Implications External disruption changes the ecosystem survival rules and therefore changes evolutionary pathways Change takes much time to appear as statistical processes require a large number of generations to manifest themselves. In the short term, things may appear to be stable Only the long term matters Perturbations • Random large scale catastrophes (to be discussed next week) can reset both the evolutionary clock and the evolutionary timescale • This is been a very important component of evolution on Earth.