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what is down syndrome any its …

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what is down syndrome any its causes?
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Bhawna Yadav 5 years, 1 month ago

Define--It is an autosomal aneuploidy,caused by the presence of an extra chromosomal number 21.it is also known as 21-trisomy. Causes--Down syndrome happens when there is an extra copy of genetic material on all or part of the 21st chromosome. Every cell in the body contains genes that are grouped along chromosomes in the cell's nucleus. There are normally 46 chromosomes in each cell, 23 inherited from the mother and 23 from the father. When some or all of a person's cells have an extra full, or partial, copy of chromosome 21, the result is Down syndrome.
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