The National Cancer Institute created this online lecture to provide basic facts about genes and gene testing. The presentation is simple, and the minimum biology necessary to grasp the concepts is covered. There are over 25 pages here, but you quickly get to information about disease genes, and end up learning about the kinds of genetic mutations that can cause disease. Online presentation with graphics illustrating key concepts about gene testing with discussion of its limitations and benefits. The diagrams and sketches really get the concepts across.
Teachers can print out graphics for group use.