down syndrome......a genetic disorder

Down Syndrome is a genetic disorder characterized by mental retardation.The brain anomalies generally include low brain weight,reduced numbers of different kinds of cells,reduced number and depth of sulti in the cerebral cortex and shorter than normal dendrites.By age 40 people with the d
isorder develops further abnormalities also seen in Alzheimers Disease. Down Syndrome is rare in children of young mothers but becomes increasingly common in children born to mothers older than age of 35.