Genetic Disorders Sourcebook: Basic Consumer Health Information About Heritable Disorders, Including Disorders Resulting from Abnormalities in Specific Genes, Such as Hemophilia, Sickle Cell Disease, and Cystic Fibrosis, Chromosomal Disorders, Such as Down Syndrome, Fragile X Syndrome, and Klinefelter Syndrome, and Complex Disorders With Environmental and Genetic Components, Such as Alzheimer Disease, Cancer, Heart Disease, and Obesity; Along With Information About the Human Genome Project, Genetic Testing and Newborn Screening, Gene Therapy and Other Current Research Initiatives, the Special Needs of Children With Genetic Disorders, a Glossary of Terms, and a Directory of Resources for Further Help and Information