PEDIGREE ANALYSIS

- Ex: sickle cell anemia, downs syndrome, and cystic fibrosis

DRAWING A PEDIGREE Generations are numbered with Roman numerals (I, II, III) on the left side of the pedigree -

Key to Pedigree Symbols Male Square Female Circle Marriage Horizontal line between couple Divorce Broken horizontal line between couple Multiple marriages Numbered horizontal line between couples Death Diagonal slash over person’s symbol Siblings Vertical line from parents to a bracketed horizontal line over siblings Fraternal twins Connected by a triangular line above Identical twins Connected by a triangular line above and a horizontal line between Adoption Capital “A” inside symbol Having a trait Shaded in as specified in your key 12 or AA

SAMPLE PEDIGREE