Assertion: cystic fibrosis's parent | /r/CapableOf | show symptoms of cystic fibrosis
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text: This occurs when both parents carry the gene that leads to a mutation in the cystic fibrosis transmembrane conductance regulator (CFTR) gene; assuming both parents are carriers for the mutation, their child has a 25% chance of having that mutation, even if neither parent shows symptoms of cystic fibrosis.