Growth in the frequency of the favored allele per generation, with dominant (D) and recessive (R) modes of inheritance. Predicted behavior is given for a range of linear selection coefficients s. Allele frequency for time zero is fixed at f0 = 0.010. The recessive mode behavior is sensitive to f0, in that it affects when the rapid transition from 0.1 to 0.9 can occur. Regardless of settings, this transition is always fast, relative to the asymptotic behavior at one or the other end.