Down Syndrome by Ali Oterrab, describes the definition of down syndrome, the causes and the symptoms.

Down Syndrome is a disorder caused by an extra chromosome on the chromosome 21 pair, giving the person a total of 47 chromosomes rather than the normal 46. This disorder results in mild to severe learning disabilities and physical symptoms including a small skull, extra folds of skin under the eyes, and a flattened nose bridge. The condition was formerly known as mongolism because the features of people with Down syndrome were thought to resemble those of Mongolian …

…In the recent past, children with Down syndrome were put to institutions, receiving minimal social interaction or educational opportunities. Today, children with Down syndrome usually remain with their families and are enrolled in public schools. Often they attend regular classes and learn skills such as reading and writing alongside children without Down syndrome. Adults with Down syndrome are employed in a range of fields. Some may live in supervised group homes, while others live independently.