http://www.mdausa.org/publications/genetics.html
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Muscular Dystrophy Association
This brochure describes just what a genetic disorder is, and explains how genetic testing and counseling can help people understand how disorders that may affect themselves or their children are inherited. It also gives examples of the major patterns of inheritance, with specific neuromuscular diseases as examples. Finally, it looks at a little-known aspect of genetics called mitochondrial inheritance.