Mutation
What is a mutation? What causes mutations? Are mutations necessarily bad? It’s not all B-movie horror monsters! Read about mutation…
http://learn.genetics.utah.edu/archive/mutations/
http://www.brooklyn.cuny.edu/bc/ahp/BioInfo/MUT/Mut.Definition.html
http://ghr.nlm.nih.gov/handbook/mutationsanddisorders/genemutation