Genes can be mutated in several different ways. The simplest type of mutation involves a change in a single base along the base sequence of a particular gene--much like a typographical error in a word that has been misspelled. In other cases, one or more bases may be added or deleted. And sometimes, large segments of a DNA molecule are accidentally repeated, deleted, or moved.
![DNA Mutation](https://webarchive.library.unt.edu/eot2008/20090510045328im_/http://www.cancer.gov/images/Documents/4167b7ca-7e27-4eec-9855-640637dde5dc/cancer41.jpg)
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