Down Syndrome does not define who I am as a person : October is Down syndrome Awareness Month! What does Down Syndrome mean? The syndrome was discovered by John Langdon Down, a British physician who described the condition for the first time in 1866. The syndrome is also known as trisomy 21, because individuals with Down syndrome have an extra chromosome, a third copy of chromosome 21. That extra chromosome is the one key trait that makes us a group. However, all individuals with Down syndrome are not alike. Each one of us is one of a kind while sharing in the same humanity and condition with many others with intellectual challenges or not. Each one of us is a member of a unique family with all of the hereditary traits of many generations.
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