Examine yourself and a partner for the trait described. Record the appearance of the trait by using a capital "L" for free earlobes and a small "l" for attached earlobes. Obtain data for the whole class if possible. If you have the dominant trait you know for certain only that you have at least one dominant gene (capital letter) for the trait.

On a separate sheet of paper, draw a pedigree chart for the trait. Examine as many family members as possible. If your grandparents are available, include them in your charts.