How To Use This Guide Give Us Your Feedback  Learn The Basics • What Is Genetic Testing? • Frequently Asked Questions • The Human Genome Project • DNA, Genes And Chromosomes • Glossary • Take The Quiz  Types Of Tests Alzheimer's Disease Amyotrophic Lateral Sclerosis Ataxia Telangiectasia Breast/Ovarian Cancer Colorectal Cancer Cystic Fibrosis Down Syndrome Duchenne Muscular Dystrophy Fragile X Syndrome Hereditary Hemochromatosis Huntington's Disease Phenylketonuria Sickle-Cell Disease Tay-Sachs Disease Colorectal Cancer 'William' A father who survived cancer wants his daughter to be tested to see if she inherited an altered gene. More Case Studies   Decision Guide: Breast And Ovarian Cancer Is genetic testing right for you? Consider the many factors and issues with our interactive tool. More Decision Guides Resources National Human Genome Research Institute National Society Of Genetic Counselors Ethical, Legal And Social Issues