Cystic fibrosis pedigree.

This clinical pedigree follows cystic fibrosis through three generations. It uses the standard square and circle symbols for sex and shading or carrier marks for genetic status. The affected proband makes the reason for referral clear, while the carrier parents show why an autosomal recessive condition can appear in a child of unaffected adults. The second generation also shows that a carrier sibling may have affected children with another carrier partner. A genetic counselor can use this kind of drawing to gather a family history, explain recurrence, and identify relatives who may want testing. It is a teaching example, not a substitute for a genetic test result or clinical advice.