Two common types of muscular dystrophy (MD) are Duchenne muscular dystrophy (DMD) and Becker muscular dystrophy (BMD). Visit the MDA website and left click on the Diseases button. Then left click on the Duchenne Muscular Dystrophy link. Finally, scroll down to the Basic References list and left click on the Facts About Duchenne & Becker MD link. Use the links on the left side of this page to read about these two types of MD, then write an essay to describe what these two types of MD are, what causes them, what happens to the muscles, and how they are diagnosed.