This document contains slides from a PowerPoint presentation on genetics concepts related to cancer. It discusses somatic mutations that can cause cancer within an individual's lifetime. The slides show diagrams of the genetic basis for both sporadic cancers caused by mutations in somatic cells and inherited cancer syndromes caused by a heritable mutation. Mosaicism is also described, where a post-zygotic mutation results in some cells having a normal genotype and others an abnormal one. The slides can be used non-commercially for educational purposes.