World Down Syndrome Day (WDSD) is marked each year on March 21, World Down Syndrome Day beginning in 2006.selected to signify the uniqueness of the triplication (trisomy) of the 21st chromosome which causes Down syndrome. |
World Down Syndrome Day (WDSD) is marked each year on March 21, World Down Syndrome Day beginning in 2006.selected to signify the uniqueness of the triplication (trisomy) of the 21st chromosome which causes Down syndrome. |