Down's syndrome 'treated' with green tea: study

Also known as trisomy 21, the condition is caused by the presence of an extra, or third, copy of chromosome number 21.

There is more than one kind of DownSho which go by a different names.

Other conditions arise if the duplicated chromosome is a different chromosome. If the trisomy is chromosome 13, the person will have Patau's syndrome. If the trisomy is chromosome 18, the person will have Edward's syndrome. These conditions are rarer than Down syndrome and have their own characteristics which are different than Down syndrome.