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Unformatted text preview: 9 October 2009 Brandon: ignore section 4, consequences. HW1: gene freqs are constant over time if: [list]:- Selection = 0- I/e = 0- Mutation =0- Random mating- No drift HW2: gene freqs are constant if:- Same, except #5: populations are infinite. [Not a force! Then drift isnt a force either. ] Its not the HW law that gives us the role of drift in evolution; in fact, theres a first law, the zero force law that is logically prior to the second law of PNS. It sets the default condition. He states it closely to Newtons law because he wants to make the comparison. Even when nothing exemplifies the law, it doesnt make it less of a law. The zero force law for biology is the same: A. Population at equilibrium will drift away from it unless acted on by an evolutionary force. B. A population moving in trajectory t caused by evolutionary force F, will move away from t- path in either direction/magnitude/both (diff path, rate of change) as F is removed (provided nothing else changes). And if F isnt removed, but no other forces are added, it continues on nothing else changes)....
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This note was uploaded on 02/22/2012 for the course HIST 2312 taught by Professor Staff during the Fall '10 term at Texas State.
- Fall '10