A pedigree traces the history of traits in a family. This chart shows which family members have a particular trait. The chart is formed by different symbols. When a shape is shaded, it stands for individuals who show a form of a particular trait. Circles stand for females. Squares represent males. Male and female parents are represented by a square and circle connected by a(n) horizontal line. Another line connects the children, with the oldest at the left. Parents are connected to their offspring by a(n)vertical line. An individual who has inherited a factor for a trait but doesn’t show that trait is called a(n) carrier.