These class notes from a Microbiology course at Acadia University outline point mutations, frameshift mutations, mutagens, mutation rate, and mutant isolation. A good way to review already learned concepts.

Good explanation of the different types of mutations. Solid background on base-pair substitution.

A good overview of mutation types, causes, and effects. Scroll down to the section on types of mutations for a good overview of frameshifts.

[Free Registration/Login may be required to access all resource tools.] Summarizes the key points about adaptations, mutation, evolution, and natural selection. Includes a few questions to check for understanding.