Disruptive selection describes changes in population genetics in which extreme values for a trait are favored over intermediate values and it is also called as diversifying selection. In this case, the variance of the trait increases and the population is divided into two distinct groups. Directional selection is a mode of natural selection in which an extreme phenotype is favored over other phenotypes, causing the allele frequency to shift over time in the direction of that phenotype. Stabilizing selection is a type of natural selection in which the population mean stabilizes on a particular non-extreme trait value.