Source: Pedigree; Creative Commons: http://commons.wikimedia.org/wiki/File:Autosomal_Dominant_Pedigree_Chart2.svg
An individual who is carrying a trait genotypically but does not display it phenotypically.
A genetic characteristic that is not typical (example: 6 toes).
A genetic characteristic that causes health problems (example: Huntingtons Disease).
A chart used to track a trait through a family tree.