Give an account of Down’s syndrome.
Answers
Down's syndrome is a genetic disorder caused by the presence of all or part of an extra copy of chromosome 21. ... Down's syndrome (also known as Down syndrome and trisomy 21) occurs in one in every 1,000 live births but accounts for around 2 per cent of all spontaneous abortions
In every cell in the human body there is a nucleus, where genetic material is stored in genes. Genes carry the codes responsible for all of our inherited traits and are grouped along rod-like structures called chromosomes. Typically, the nucleus of each cell contains 23 pairs of chromosomes, half of which are inherited from each parent. Down syndrome occurs when an individual has a full or partial extra copy of chromosome 21.
This additional genetic material alters the course of development and causes the characteristics associated with Down syndrome. A few of the common physical traits of Down syndrome are low muscle tone, small stature, an upward slant to the eyes, and a single deep crease across the center of the palm – although each person with Down syndrome is a unique individual and may possess these characteristics to different degrees, or not at all.
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