Why?: If you are 45 and have not manifested signs of cystic fibrosis then you don't have it and need not worry. The disease is a genetic defect that requires both genes of the pair to be effected to manifest itself. If you and your partner each carry one defective gene then 25% of your children on average could be affected. See: http://en.Wikipedia.Org/wiki/cystic_fibrosis for more info.
Answered 6/5/2013
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