Sheree is referred to a genetic counselor because a cystic fibrosis (CF)test done as a routine part of her prenatal care indicated that she is a carrier of the most common mutant allele.Sheree is stunned,because no one in her family has the disease.She is 26 years old.The genetic counselor would most likely

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The fact that Sheree is a carrier indicates autosomal recessive inheritance. The genetic counselor would suggest that Sheree's husband be tested for CF to determine if he is also a carrier. If both Sheree and her husband are carriers, there is a 25% chance that their child could inherit two copies of the mutant allele and develop CF. Amniocentesis may be considered later in the pregnancy, but it is not the first recommendation.

Sheree Is Referred to a Genetic Counselor Because a Cystic