Claim: Down syndrome is an ailment.
Evidence: Down syndrome -LRB- DS or DNS -RRB- , also known as trisomy 21 , is a genetic disorder caused by the presence of all or part of a third copy of chromosome 21.
A genetic disorder is a genetic problem caused by one or more abnormalities in the genome , especially a condition that is present from birth -LRB- congenital -RRB-.