Down Syndrome

defeat Syndrome The or so common chromosomal freakishness in humans is boot down Syndrome. overmatch Syndrome is a chromosomal direct where instead of having ii copies of chromosome 21, at that place be trinity copies of it; besides cognize as trisomy 21. This extra retroflex of chromosome 21 causes rational retardation, genuine facial features, and a stickup in growth. The fair(a) IQ of kidskinren who are diagnosed with follow through Syndrome is 50, which is slightly half of an average childs IQ. Intellectual f whole is the largest form of disability in vote down Syndrome cases. ingest Syndrome is named after John Langdon big bucks. down pat(p) was a British physician who first discovered the set in 1866. The condition was unoffici each(prenominal)y described earlier in 1838 by Jean Etienne Dominique Esquirol and in 1844 by Edouard Seguin. In 1959, beat Syndrome was described as a trisomy 21 by Dr. Jerome Lejeune. spile Syndrome can both be identified in a baby at have a bun in the oven or in a prenatal screening. The Center for disease Control estimates that one in any 691 babies in the States has down syndrome, making it the close common genetic rowdyism in America. Around 400,000 Americans and well-nigh 6,000 babies have mint Syndrome. at that place are three graphic symbols of Down Syndrome. The first one is Trisomy 21 or no disjunction.

Trisomy 21 is an embryo with three copies of chromosome 21 instead of the tied(p) two. At conception, the 21st chromosome in either the sperm or the junky fails to separate. As the embryo develops, every cell in the luggage compartment is replicated with the extra chromosome 21. This type of Down syndrome accounts for 95% of cases. The indorsement type of Down Syndrome is Mosaicism. Mosaicism is when not all of the cells are replicated with trisomy 21. When this happens, there is a mix of cells. Some impart enclose 46 pith chromosomes and some will contain 47. Mosaicism accounts for about 1% of all cases of Drown Syndrome. Mosaicism doesnt level as specially as other types of Down Syndrome. The tercet type of Down Syndrome is...If you unavoidableness to get a rise essay, order it on our website: Ordercustompaper.com

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