ANSWERS: 2
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Just one. If both have it then your chances increase greatly.
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actually both parents have to have it. cystic fibrosis is a recessive gene. so both parents must have it for the child to have it. if one parent did not their would be a dominant gene present .so the child would not have it, but would be a carrier. so yes both parents must have it for the child to . hope i helped :)
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