
Down’s syndrome, also known as trisomy 21, is a genetic condition caused by the presence of an extra, or third, copy of chromosome number 21. Humans normally have 23 pairs of chromosomes, which contain up to 25,000 protein-coding genes. In Down's syndrome, the extra copy causes some of the genes in chromosome 21 to be "over-expressed," which affects the growth of the brain and skeleton. This can lead to learning disability and other cognitive issues, and physical characteristics such as short stature and facial differences.
Down's syndrome is the most common genetic form of intellectual disability, and afflicts approximately one in 1,000 people, as per the World Health Organisation. (Related: High pesticide exposure in pregnant women found to cause birth defects and low birth weight.)
Symptoms of Down's syndrome include:
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