Cold Spring Harbor Laboratory
Dna From the Beginning: Mutations Are Changes in Genetic Information
This article explains how and why mutations are so important to genetics.
CK-12 Foundation
Ck 12: Earth Science: Adaptation and Evolution of Populations Study Guide
[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.