describe the three types of selections :directional stabilizing and disruptive and give examples

Disruptive selection is the opposite stabilizing selection. In this case, individuals with an average value of the trait are affected most and individuals with values far from the average are affected least. However, the distribution following selection is much narrower, as particularly individuals with extreme values of the monitored trait and this selection is called stabilizing selection.If the population is present under unchanging conditions, there is usually an optimal value of each quantitative trait, for example optimal body length, this is an example of stabilizing selection. Directional selection leads to a change, not only in the average value of a particular trait, but also a change (decrease or increase in size) in the variability of the given trait in the population. A species gradually changes for example organisms either become bigger or smaller.
http://www.frozenevolution.com/selection-disruptive-stabilizing-and-directional