Trisomy 21 Down Syndrome

Trisomy 21 Down Syndrome Trisomy 21 is caused, as the name suggests, by the triplication of the 21st chromosome. Genes which, simplified, birth the blueprints for our cellular structure, argon grouped on rod-like structures called chromosomes. Normally, the nucleus of each cell consists 23 pairs of chromosomes, half of which be inherited from each parent. In Down syndrome (DS), however, the cells usually contain not 46, but 47 chromosomes. This excess genetic material, in the form of additional genes along the 21st chromosome, results in DS. The estimated relative incidence of Down syndrome is between 1 in 1,000 to 1 in 1,100 live births. Each year approximately 3,000 to 5,000 children are born(p) with this chromosome disorder. It is believed in that respect are about 250,000 families in the United States who are alter by DS. (Berg, 614) Discussed in this paper will be a more detailed description of the pathophysiology of Down syndrome, as hygienic as the discovery, possible causes, phys...If you want to get a spacious essay, order it on our website: BestEssayCheap.com

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