Moles occur when cells in the skin grow in a cluster instead of being spread throughout the skin. These cells are called melanocytes, and they make the pigment that gives skin its natural color. Moles may darken after exposure to the sun, during the teen years, and during pregnancy.
A pedigree chart is used to show your family tree of traits. An example is if a diagram shows your mom who had brown hair and your dad has red hair and then it shows all of th â¦ e children they had and shows what color hair they had.
The pedigree will typically show one kind of trait and the affected members of a family. Take a look at if the trait is dominant or recessive first. Once you have that figured â¦ out, start to predict the genotypes of the individuals in the pedigree chart.