Down Syndrome 2

Down syndrome is one of the most frequently occurring
birth defects in the world. It is a chromosomal abnormality
which results in 47 chromosomes, instead of 46, with an extra
chromosome being 21. Because the majority of Down syndrome
cases affect the twenty-first chromosome, it is commonly called
"trisomy 21."
Down syndrome is usually caused by a cell division error,
which is known as non-disjunction. This occurs when an embryo
develops with three number 21 chromosomes instead of two. This
excess genetic material alters the course of development and
causes the characteristics of this syndrome. The cause of this
faulty cell division is still unknown, although there seems to
be ...

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chromosome results in the
affects of the syndrome. With translocation, most cases occur
sporadically, with no bearing on maternal age. These two types
of this syndrome are very rare, being responsible for only 6 or
7 percent of all cases.
Children with Down syndrome are at high risk for health
problems. These include congenital heart defects, respiratory
problems, increased suseptibility to infections, and/or
obstructed digestive tracts. Leukemia has a greater frequency
of appearance among children with Down syndrome, and adults are
at an increased risk for Alzheimer's disease. Advances in
medicine have helped these individuals with their health
problems, and generally people with Down syndrome have a life
expectancy of 55 years.
The mental development of people with Down syndrome is
challenged through some degree of mental retardation. Typically,
the level of mental retardation falls into the mild to moderate
range, but some cause can range ...

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Down Syndrome 2. (2003, December 31). Retrieved February 23, 2019, from
"Down Syndrome 2.", 31 Dec. 2003. Web. 23 Feb. 2019. <>
"Down Syndrome 2." December 31, 2003. Accessed February 23, 2019.
"Down Syndrome 2." December 31, 2003. Accessed February 23, 2019.
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Added: 12/31/2003 10:48:48 PM
Category: Science & Nature
Type: Premium Paper
Words: 474
Pages: 2

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