Реферат: Down Syndrome Essay Research Paper Down SyndromeDown

chromosomes by a sperm with a normal assortment of 23, but they have also

found that the sperm can carry the extra chromosome as well. The abnormal

ovum or sperm is derived from a germ cell in which the pair of 21st

chromosomes holds together and passes into the same sperm or ovum instead

of separating. In the type of Down syndrome called translocation, the extra

chromosome 21 material is attached to one of the other chromosomes; when

some, but not all, of the body’s cells carry an extra chromosome 21, the

condition is a type of Down syndrome called mosaicism.

Down syndrome is not yet responsive to medical treatment, but better

medical care of the accompanying disorders and infections now results in an

almost normal life span instead of the previous life expectancy of about 14

years. The severely retarded may still be institutionalized, but many Down

syndrome children are raised at home, where their full potential can be

developed. Although, with an average mental age of about eight years, they

continue to need a protective environment, many adults with Down syndrome

work in sheltered workshops; some hold regular jobs in business and industry.

Bibliography

www.downs.com

www.americahealth.net