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What is Down syndrome?

Down syndrome, also known as Down's syndrome or trisomy 21, is a genetic condition. Normally our genetic make-up is comprised of 46 chromosomes, 23 from our mother and 23 from our father. In the case of Down syndrome, an extra chromosome 21 is included in every cell, making a total of 47 chromosomes present. This additional chromosome accounts for some different physical characteristics.

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Author: Dr Idan Ben-Barak PhD, MSc, BSc (Med)
First answered: 07 Oct 2014
Last reviewed: 14 May 2019
Rating: 5.0 out of 5
Votes: 1530 (Click smiley face below to rate)
Category: Fetal alcohol syndrome

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