Q.Mention the symptoms of Downs syndrome.

Step 1. Recall the cause: Down's syndrome results from a trisomic (three-copy) condition of chromosome 21.

Step 2. List the symptoms exactly as given in the text: severe mental retardation, defective development of the central nervous system, increased separation between the eyes, a flattened nose, malformed ears, and a mouth that remains constantly open with the tongue protruding. …

List the text's stated symptom set for Down's syndrome and tie it back …

• Listing only 'mental retardation' without the accompanying physical/facial fe …