Insecticide resistance If the frequency of a gene for insecticide resistance is p (a constant), then its frequency in the next generation is given by the expression p(1 + s) f = 1 + sp where s is the reproductive advantage this gene has over the wild type in the presence of the insecticide. Often the selective advantage s is very small. Approximate the frequency in the next generation with a linear approxima- tion, given that s is small.

Insecticide resistance If the frequency of a gene for insecticide resistance is p (a constant), then its frequency in the next generation is given by the expression p(1 + s) f = 1 + sp where s is the reproductive advantage this gene has over the wild type in the presence of the insecticide. Often the selective advantage s is very small. Approximate the frequency in the next generation with a linear approxima- tion, given that s is small.