A genetic condition caused by extra genetic material from the 21st chromosome. The extra genes cause certain characteristics that are recognised as Down’s Syndrome, but individuals with the condition will also have all the other genes given to them by their parents. This results in the combination of futures typical of Down Syndrome on top of the individual features from their parents. This includes some degree of cognitive disability and other developmental delays. Some of the physical traits that are common, but are not always present, or epicanthal folds over the eyes, flattened bridge of the nose, a single palmar crease and decreased muscle tone.