Popular television shows, such as Finding Your Roots and Who Do You Think You Are?, have ignited a renewed passion for traditional genealogical research and thrown genetic ancestry testing into the spotlight. Once a tool only for historians and forensic scientists, DNA testing is now available directly to the consumer. Supporting the Next Generation Science Standards on heredity and inheritance of traits, this book uses simple language and detailed images and charts to explain how genetic ancestry testing is done, what it can, and cannot, reveal about a family tree, and the potential unintended consequences of being tested. Sidebars offer information about related topics, such as the Human Genome Project, mitochondrial Eve, and genetic genealogy careers.