Denyse O'Leary is the News blogger for Uncommon Descent
Cell biology Genetics Intelligent Design

It just so happens that essential genes are protected from mutations

At The Scientist: Monroe and his colleagues found evidence of specific epigenetic characteristics such as cytosine methylation that prevent mutations from occurring in those regions, not unlike protective barriers. These structures and the variability in mutation rates within a single organism’s genome, Monroe says, suggest that “evolution created mechanisms that changed how evolution works.”