background of down syndrome

Down syndrome is a genetic disorder, in which there is a mutation in the development of an egg or sper cell. This causes an extra chromosome, usually known as chromosome number 21.This disorder is passed down from parent to offspring.Children born with down syndrome have a wide range of mental retardation, some parts of the body may develop faster that otheres, which can lead to heart defects. Even tough children born with down syndrome have mental retardation, they are just like us, the only difference is that they develop more slowly than regular people.