Cystic Fibrosis (CF) Is a Common Disease in European Populations

Multiple Choice

Cystic fibrosis (CF) is a common disease in European populations. Most individuals with the disease have the same mutation in the CF gene. What does this suggest about the evolution of CF?

A) The CF mutation first arose in Africa
B) The CF mutation is more common in homozygotes than in heterozygotes
C) Carriers of the European CF mutation are descended from the same person
D) There is a common variant for CF