Down syndrome occurs when an individual has a full or partial extra copy of chromosome 21.This additional genetic material alters the course of development even causes the characteristics associated with down syndrome.
There are three types of down syndrome : trisomy 21 (nondisjunction) accounts for 95% of cases,translocation accounts for about 4% and mosaicism accounts for about 1%.
Down syndrome is the most commonly occurring chromosomal condition.One in every 691 babies in the United States is born with down syndrome. There are more than 400 000 people living with down syndrome in the United States.
Down syndrome occurs in people of all races and economic levels.The incidence of birth of children with down syndrome increases with the age of the mother. But due to higher fertility rates in younger women , 80% of children with down syndrome are born to woman under 35 years of age.
People with down syndrome have an increased risk for certain medical conditions such as congenital heart defects , Alzheimer's disease , childhood leukemia,and thyroid conditions.Many of these conditions are now treatable ,so most people with down syndrome lead healthy lives.
PEOPLE WITH DOWN SYNDROME SHOULD BE TREATED WITH
HEALTH CLASSES AND BE TREATED RIGHT .
THIS GIRL HAS DOWN SYNDROME
AND IS DOING GYMNAST IN HER
HARD LIVING LIFE.