This is an example of HBDI Diabetes Catalog page. A pedigree chart is very similar to a family tree - one that contains disease and other information. In genetics a pedigree can track any observable or measurable trait.
Circles are female, squares male.
Open symbols represent unaffected individuals, black symbols represent affected individuals. This family has 3 type I diabetic children. Members 4 and 5 are female identical twins that are affected. Using this convenient format, scientists can readily select families that exhibit specific relationships relevant to their research. Lee Ducat Major Accomplishments Founded the Juvenile Diabetes Foundation, Philadelphia Chapter, May 21, 1970.