Down syndrome or Down's syndrome, also known as trisomy 21, is a genetic disorder caused by the presence of all or part of a third copy of chromosome 21. It is usually associated with physical growth delays, mild to moderate intellectual disability, and characteristic facial features. The average IQ of a young adult with Down syndrome is 50, equivalent to the mental ability of an eight- or nine-year-old child, but this can vary widely.  Read more..

This article uses material from the Wikipedia article "Down_syndrome", which is released under the Creative Commons Attribution-Share-Alike License 3.0.

On the occasion of World Down Syndrome Day, the Post of Moldova has put into circulation a special postmark, designed by Maria Maximenco, on March 21, 2021. World Down Syndrome Day is celebrated every year on March 21 to raise awareness of Down's syndrome. March 21 (the 3rd month of the year) was chosen to signify the uniqueness of the triplication (trisomy) of the 21st chromosome at the origin of this Down syndrome.. Read more..