Down syndrome was discovered in 1886 after Dr. J.L. Down, the man credited with first describing the disorder. Down syndrome is the most commonly occurring chromosomal abnormality, resulting when an individual possesses three, rather than two, copies of the 21st chromosome. This excess genetic material affects a persons’s physical and cognitive development. People with Down syndrome will have some degree of Intellectual disability, usually in the mild to moderate range. There are three types of chromosomal patterns that result in Down syndrome, they are: Trisomy 21, Translocation and Mosaicism. There are many physical characteristics associated with Down syndrome such as beautiful, almond-shaped eyes, low muscle tone, sometimes protruding tongue, a flatter facial profile, as well as increased risk of certain medical conditions. Every person with Down syndrome is a unique individual, like anyone else, and will possess these characteristics to varying degrees. The important thing to remember is that people with Down Syndrome are “more alike than different” than the typical people around them.
For More information on the types of Down syndrome, please visit the Canadian Down Syndrome Society (CDSS)