1.) natural selection on single gene traits can lead to changes in allele frequencies and a change in phenotype.
2.) Natural selection on polygenic traits can effect the distributions of phenotypes in the three ways. Direcytional selection, stabilizing selection, or disruptive selection
3.)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.
4.)Stabilizing selection is when the population mean stabilizes on a particular non-extreme trait value.
5.)Disruptive selection is changes in population genetics in which extreme values for a trait are favored over intermediate values. the deviation of the trait increases and the population is divided into two distinct groups.