Please forward this error screen the development of young children with down syndrome 77. Follow the link for more information. Causes Third copy of chromosome 21.
21, is a genetic disorder caused by the presence of all or part of a third copy of chromosome 21. The parents of the affected individual are typically genetically normal. The extra chromosome occurs by chance. The possibility increases from less than 0. There is no cure for Down syndrome. Education and proper care have been shown to improve quality of life. Some children with Down syndrome are educated in typical school classes, while others require more specialized education.
Down syndrome is one of the most common chromosome abnormalities in humans. It occurs in about one per 1,000 babies born each year. In 2015, Down syndrome was present in 5. Those with Down syndrome nearly always have physical and intellectual disabilities. As adults, their mental abilities are typically similar to those of an 8- or 9-year-old. Individuals with Down syndrome are at increased risk for obesity as they age. Commonly, individuals with Down syndrome have better language understanding than ability to speak.
This includes an increased risk of a specific type of seizure called infantile spasms. Hearing and vision disorders occur in more than half of people with Down syndrome. Although the overall risk of cancer is not changed, the risk of leukemia and testicular cancer is increased and risk of solid cancers is reduced. Cancers of the blood are 10 to 15 times more common in children with Down syndrome. Low thyroid is the most common form, occurring in almost half of all individuals.
Constipation occurs in nearly half of people with Down syndrome and may result in changes in behavior. Individuals with Down syndrome tend to be more susceptible to gingivitis as well as early, severe periodontal disease, necrotising ulcerative gingivitis, and early tooth loss, especially in the lower front teeth. Individuals with Down syndrome also tend to have a more alkaline saliva resulting in a greater resistance to tooth decay, despite decreased quantities of saliva, less effective oral hygiene habits and higher plaque indexes. Higher rates of tooth wear and bruxism are also common. Males with Down syndrome usually do not father children, while females have lower rates of fertility relative to those who are unaffected. Menopause typically occurs at an earlier age. Down syndrome is caused by having three copies of the genes on chromosome 21, rather than the usual two.