A mutagen is an agent that causes a change to the content of some genetic material. A mutation is a change to genetic material. Contrary to what at least on other answer says, “mutation” is not the same as disease and cannot be defined as such. read more
The main difference between a mutagen and mutation is that the former is an agent, mostly external, causes change in the genetic material (DNA), while the latter (mutation) stands for any change in the genetic material that results change in the genetic trait. read more
Best Answer: A mutagen is something (almost always a chemical, but could be high energy radiation) that causes mutations (base pair changes or deletions, or even larger deletions) to DNA. read more