Down's syndrome is a genetic condition involving an extra chromosome, this change occurs around the time of conception. A person with Down's syndrome has forty-seven chromosomes instead of the usual forty-six. A relatively common genetic disorder, Down's strikes 1 out of 600 babies. In 95 percent of all cases, the disorder originates with the egg, not the sperm, and the only known risk factor is advanced maternal age-at age 35, a woman has 1 chance in 117 of having a baby …showed first 75 words of 2661 total…

…showed last 75 words of 2661 total…of atlanto-dens relationships in asymptomatic         individuals with Down syndrome. Paediatrics 89 (6) pg. 1194-1198. Selikowitz, M.(1990). Down Syndrome - the facts. Oxford:Oxford University Press. Stray-Gundersen, K. (Ed.) (1995). Babies with down syndrome: A new parents' guide         (2nd edition).         Rockville, MD: Woodbine House. Tingey, C. (Ed.) (1988). Down syndrome: A resource handbook. Boston, MA: College-         Hill Press. www #1. http://www.erms.edu/jones/depthome.htm www #2. http://ptolemy.eess.edu/ds.html www #3. http://wwwpino/ds/prenata/nsdcapf.html