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Down-Syndrme

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Submitted By Coder1963
Words 1776
Pages 8
Kimberly Douglas
Dec 3 2014
Genetics
Down Syndrome Down syndrome (DS) or Trisomy 21 is a complex developmental genetic disorder in which a person has 47 chromosomes instead of 46. Normally, a fertilized egg has 23 pairs of chromosomes. But in most cases, people living with Down syndrome have an extra copy of chromosome 21 also known as Trisomy 21, which is responsible for 95% Down syndrome cases and most common genetic cause of human mental retardation, with an incidence of 1-600/1-1000 live births. It is also responsible for premature pregnancy failure. It is the leading cause of cognitive impairment. Down syndrome occurs because of an abnormality characterized by 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 or center. There are normally 46 chromosomes in each cell, 23 inherited from your mother and 23 from your 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. Down syndrome is associated with mild to moderate learning disabilities, developmental delays, characteristic facial features, and low muscle tone in early infancy. Many individuals with Down syndrome also have heart defects, leukemia, early-onset Alzheimer's disease, gastro-intestinal problems, and other health issues. The symptoms of Down syndrome range from mild to severe. Life expectancy for individuals with Down syndrome has dramatically increased over the past few decades as medical care and social inclusion have improved. A person with Down syndrome in good health will on average live to age 55 or beyond. First diagnosed by John Langdon Down in 1866, the most common form of Down syndrome is called trisomy 21, which occurs as a result of "nondisjunction" during cell division as a fetus first

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