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(Left) The relative probability of fixation of a modifier allele that changes the recombination rate from 0 to r for different values of sd. (Right) The decrease in the rate of the ratchet caused by the fixation of the modifier allele. In both graphs Ud = 1 and N = 1000; solid squares correspond to sd = 0.1, open squares to sd = 0.2, and open diamonds to sd = 0.05.
