Trisomy 13, trisomy 18, and trisomy 21 are all causes of mental retardation associated with

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Trisomy 13, trisomy 18, and trisomy 21 all involve having more than the normal number of chromosomes. Trisomy 13 and trisomy 18 are caused by the presence of an extra copy of chromosome 13 or 18, respectively, while trisomy 21 (also known as Down syndrome) is caused by the presence of an extra copy of chromosome 21. All of these genetic conditions are associated with intellectual disability, as well as other physical and developmental abnormalities.

Trisomy 13, Trisomy 18, and Trisomy 21 Are All Causes