Blog # 4 Describe the three types of selection: directional, stabilizing and disruptive and give an example of each in your own words

                     Directional Selection occurs when selection favors one extreme trait value over the other extreme. It ususally happens in the mean value of the trait under selection. A Disruptive Selection occurs when selection favors the extreme trait values over the intermediate trait values. In this situation the variance increases while the population is seperated into two different groups. It plays an important role in speciation. Stabilizing Selection happens when selection favors the intermediate trait value over the extreme values. Populations under this type of selection can usually go through a decrease in the amount of additive genetic variation for the trait under selection.