<prompt> Cystic fibrosis is inherited as an autosomal recessive condition. A normal couple has one daughter affected with the disease. They are now planning to have another child. What is the chance of her sibling being affected by the disease?3-Apr2-Jan4-Jan4-Mar  <response>: Siblings have one in four chance of being affected in Autosomal recessive diseases. Ref: Robbins Basic Pathology, 7th Edition, Page 215. 