Because CF is inherited in an autosomal recessive pattern, a person must inherit two mutations in the CFTR gene, one from each parent, in order to manifest symptoms. Those who inherit only one mutation are classified as carriers and are not expected to develop CF symptoms. A child has a one in four chance of having CF if both parents are carriers, and a one in two chance if one parent has CF and the other is a carrier (see Figure 1). For a given couple, the risk of inheritance remains the same with each pregnancy.