During directional selection is when those that have some kind of unique trait are purposely chosen to mate continue those traits. Such as greyhound dogs are specifically known for their speed, if breeders chose the fastest dogs and breed them, they will be able to produce fast dogs.Stabilizing selection kinds of balance everything out because it produces the normal traits. It creates a cross between a big and small dog to a median size dog.Disruptive selection is similar to directional selection because it favors the unique traits but like it sounds it happens quickly and help select extreme traits in order to survive. For
example if birds with median sized beaks lost their food source,then disruptive selection would have to favor big or small beaks to survive.link location:
http://images-mediawiki-sites.thefullwiki.org/04/3/3/0/1793564074574269.png
