Mutation
From RationalWiki
In biological evolution, mutation refers to a change in the sequence of base pairs in a chromosome. Such changes are usually random, caused by copying errors or some external cause such as radiation or chemical action.
[edit] Creationists on Mutations
It is an oft quoted position of creationists that mutations can only be harmful, or at best, neutral. Evidence of positive mutations is studiously ignored by them.
Peppered moths anyone? Nylon eating bacteria, anyone?... Antibiotic-resistant bacteria, anyone?...

