English: Results of a hypothetical replicated artificial selection experiment with three treatments. At generation 0, the base population of organisms had been randomly sampled to create six lines, two of which would be selectively bred for high values of the trait, two for low values of the trait, and two of which would not experience any intentional selection. The control lines diverged somewhat by random genetic drift and possibly unique mutations, but, overall, did not change in their average phenotype from the beginning of the experiment. Both of the high-selected lines reached apparent selection limits around generation 20. Both of the low-selected reached absolute limits near zero around generation 25.