... 100. The cause of Down syndrome is an extra chromosome. In 95 percent of the cases, the child has three instead of two chromosomes on the 21 chromosome. There is a test called amniocentesis that can tell the mother if her child will have Down syndrome. Amniocentesis involves inserting a needle into the amniotic sac to withdraw a small about of the amniotic fluid ... see if the child has Down syndrome. There is small risk of a miscarriage or infection to the uterus. Women over the age of thirty-five are encouraged to take the test. Down syndrome is the most prevalent chromosomal disorder...

• Word Count: 1451
• Approx Pages: 6
• Grade Level: High School