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Mendelian genetics


Cystic fibrosis is an autosomal recessive disease caused by mutations in the cystic fibrosis transmembrane conductance regulator (CFTR) gene. Individuals with cystic fibrosis have sticky mucus in their lungs and other organs. This mucus can lead to infections and additional complications.
Which of the following pedigrees shows a likely pattern of inheritance in a family with a history of cystic fibrosis?
A clear circle labeled unaffected female, a clear square labeled unaffected male, a solid colored circle labeled affected female, and a solid colored square labeled affected male.
Choose 1 answer: