Assertion: cystic fibrosis | /r/HasProperty | a 1 in 2 chance
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text: However, if both parents are carriers of the defective gene, then it is probable that their child will have a 1 in 4 chance of contracting Cystic Fibrosis, a 1 in 2 chance of being a carrier (but completely healthy), and a 1 in 4 chance of being totally unaffected.