Down's syndrome

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Down syndrome or [[Trisomy 21|trisomy 21]] is a trisomic condition in which the [[Zygote|zygote]] inherits an extra [[Chromosome|chromosome]] 21 for a total of 47 [[Chromosome|chromosomes]], due to non-disjunction of chromosomes.&nbsp;It happens in about 1 in 800 births, a big proportion comparing with other syndromes. Down syndrome can be predicted through amniocentesis, but not prevented. The possibility to be born a baby with down syndrome&nbsp; is increased when the mother is older. In Down syndrome&nbsp; there are mental and physical disfunctions like [[Heart disease|heart disease]], celiac disease, eye problems, hearing, skeletal intestinal problems, dementia and thyroid disfunctions. A Down person has some characteristics like flat face, short neck, abnormally shaped ears, poor muscle tone, small hands and feet <ref>http://kidshealth.org/parent/medical/genetic/down_syndrome.html#</ref>&nbsp;<ref>http://www.nichd.nih.gov/health/topics/down_syndrome.cfm</ref>&nbsp;<ref>http://www.nlm.nih.gov/medlineplus/downsyndrome.html</ref>&nbsp;<ref>http://www.medicinenet.com/down_syndrome/article.htm</ref>.<br>
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Down's syndome is a chromosoal disorder caused by having 3 copies of chr an extra chromosome on chromosome 21 (referred to as trisomy 21), giving a total of 47 chromosomes instead of the normal 46 in humans. This extra chromosome copy affects how the brain and body develops, thus affecting both physical development and intellectual ability. Although individuals with Down's syndrome behave and look similar, their intellectual capability varies from mild to moderately low.&nbsp;
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=== Types  ===
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There are three main types of Down's syndrome
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=== Causes ===
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=== Typical characteristics ===
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*Flat face
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*Short neck
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*Abnormally shaped ears
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*Poor muscle tone
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*Small hands and feet
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=== Symptoms ===
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*Heart disease
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*Coeliac disease
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*Eye problems
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*Hearing problems
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*Skeletal intestinal problems
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*Dementia
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*Thyroid dysfunction<br>
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=== Diagnosis ===
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=== Treatment&nbsp; ===
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=== Related conditions and disorders ===
  
 
=== References<br>  ===
 
=== References<br>  ===
  
 
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<references /><br>

Revision as of 23:18, 30 November 2015

Down's syndome is a chromosoal disorder caused by having 3 copies of chr an extra chromosome on chromosome 21 (referred to as trisomy 21), giving a total of 47 chromosomes instead of the normal 46 in humans. This extra chromosome copy affects how the brain and body develops, thus affecting both physical development and intellectual ability. Although individuals with Down's syndrome behave and look similar, their intellectual capability varies from mild to moderately low. 

Contents

Types

There are three main types of Down's syndrome

Causes

Typical characteristics

Symptoms

Diagnosis

Treatment 

Related conditions and disorders

References


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