Which statement expresses accurately the genetic implications of cystic fibrosis (CF)?
A) If it is present in a child, both parents are carriers of this defective gene.
B) It is inherited as an autosomal dominant trait.
C) It is a genetic defect found primarily in non-Caucasian population groups.
D) There is a 50% chance that siblings of an affected child also will be affected.

Question

Quizplus · Accepted Answer

CF is an autosomal recessive gene inherited from both parents and is found primarily in Caucasian populations.An autosomal recessive inheritance pattern means that there is a 25% chance that a sibling will be infected but a 50% chance a sibling will be a carrier.

Which Statement Expresses Accurately the Genetic Implications of Cystic Fibrosis