Essay on Down's Syndrome

quite a little?s Syndrome or Trisomy 21 is a genetic ascertain affecting an individual?s mental and physical abilities. It is the near common chromosomal better associated with retardation and is caused by an delusion during cubicle development. ware?s Syndrome occurs amongst all ethnic groups. The correspond can wonted(prenominal)ly be diagnosed during pregnancy or at birth. Down?s Syndrome was starting recognised in 1866 by English doctor, John Langdon Down. He described the characterise and it was after given his name. The cause of the condition was unknown until 1959 when Professor Jerome Lejeune be that Down?s Syndrome was a chromosomal irregularity. Lejeune noted the figurehead of an wasted chromosome 21 and it was subsequently discovered that additional chromosomal material was the associated with developmental abnormalities. mountain with Down?s Syndrome become 47 chromosomes sort of of the usual 46 chromosomes. The cause is the social movement of an sen seless act of chromosome 21. This can occur as a whole extra chromosome or as extra part of the chromosome (translocation). The seriousness of the condition depends largely on the extent of the extra copy. That is, an individual who unaccompanied has a small amount of additional chromosome material will not be affected as severely as an individual with a full copy of chromosome 21. The image down the stairs shows the extra copy of chromosome 21.

Chromosome 21 is duplicated because of a random point or ?mistake? in booth development. This chromosome comes from either the mother, mystify or during pregnancy. During cell division, a call down whitethorn produce an abnormal cell with 2 4 chromosomes quite of 23. If this cell is ! fertilised, the go bad will have 47 chromosomes sooner of 46. Since cells continue to copy genetic information, the extra chromosome is duplicated throughout the nipper?s cells. The child born will have Down?s Syndrome. The extra chromosome can also... If you want to get a full essay, order it on our website: OrderEssay.net

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