Cause's of Down Syndrome
Couple Of Facts:
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 and 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%.
The incidence of births 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 women under 35 years of age.
The life expectancy of people with Down's syndrome has doubled in 15 years from 25 to 49 years, a new analysis of US data reveals. The research also shows people with the syndrome are much less likely to die from a range of cancers.