Down syndrome

down syndrome is a genetic disorder whereby a person has three copies of chromosome  21 instead  of two

down syndrome  is the most frequently occurring chromosomal disorder  and the leading cause of intellectual  and development  delay   in the u.s.a   .

down syndrome  here 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.People with Down syndrome attend school, work, participate in decisions that affect them, and contribute to society in many wonderfull   In every cell in the human body there is a nucleus, where genetic material is stored in genes.  

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