Do your fly work.
Download the selection and drift spreadsheet. It simulates random drift and natural selection in a haploid population of up to 100 alleles. First, simulate random drift. Hit control and the equal sign to get a new simulation. Set an initial allele frequency for the 1 allele, then hit the control-equal 100 times, and count how many times the 1 allele goes to fixation (ends up with an alele frequency of 1).
Next, simulate selection. Try different values of fitness for the 1 allele and see what happens.
Now comes the fun part--nearly neutral evolution. Give the 1 allele a fitness of 0.99, and see what happens.
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This page was last revised Nov. 17, 2005. Its URL is http://udel.edu/~mcdonald/geneticslab13.html