5.4 Pedigrees Mastery Check

Cystic fibrosis is an autosomal recessive disease where mucus develops in the lungs, liver, and the pancreas. Below is an autosomal pedigree tracing the passing of the cystic fibrosis gene through 3 generations. Note that autosomal traits can affect both males and females equally.

Huntington's disease is an autosomal dominant disorder. This means a person only needs to inherit one copy of the gene from one parent to have the disease. If a parent has Huntington's, each child has a 50% chance of getting it.