Down syndrome is caused by an extra copy of chromosome 21, causing problems with mental retardation, heart and eyesight. People with Down syndrome have distinct facial features and are usually short in stature, as babies with Down syndrome are often born smaller with fewer brain cells. Babies with Down syndrome go through cell therapy.
2. Definition its the most common identifiable form of mental retardation and is caused by an extra copy of chromosome 21 in the person's set of chromosomes ( World of Genetics . Gale, 2010)
3. Symtoms Causes problems with the mind, heart and with the eye site ( World of Genetics . Gale, 2010)
4. Life long effects Have distinct facial expressions and are usually short (Perkins) Babies born with down syndrome are born smaller and with fewer brain cells (Perkins)
6. Work Cited "Down Syndrome." World of Genetics . Gale, 2010. Gale Science In Context . Web. 7 Apr. 2011. Perkins, Stephanie. "Down Syndrome." Teen Health and Wellness. Rosen, 2011. Web. 7 Apr. 2011. <http://www.teenhealthandwellness.com/article/128/down-syndrome>.