Down Syndrome Report.

What is complicate syndrome? Down syndrome is a chromosomal dis stage characterized by the battlefront of an extra #21 chromosome. Instead of having 46 chromosomes in each(prenominal) of his/her cells, a person with Down syndrome has 47. The extra chromosome may be derived from either the egg or the sperm. It is believed that during cell division of a sperm or egg, the two #21 chromosomes do not separate properly (nondisjunction). Thus, genius cell leave al adept turn a loss an extra #21 chromosome which later, if united with a normal seminal fluid cell which has among others one #21 chromosome, may curb to trisomy 21. The offshoot cell at conception then has 47 chromosomes rather of normal set of 46 chromosomes. When this cell with trio #21 chromosomes continues to multiply, and the pregnancy is carried to term, a baby with Down syndrome will be born. This form of chromosome error, trisomy 21, is found in about 95% of persons with Down syndrome. The 5 share of babies w ith Down syndrome who do not wee trisomy 21 may have Translocation, Mosaicism or incomplete trisomy. In translocation Down syndrome, there are also one- terzetto copies of the #21 chromosome. However, one of the #21 chromosomes is attached or translocated on other chromosome, usually a #14, #21,or #22 chromosome. Three to cardinal percent of children with Down syndrome have translocation.

About one third to one half of translocations are inherited from one of the enkindles. When this happens, the common carrier put forward has the normal amount of genetic material, however one of the #21 chromosomes is attache d to another chromosome. As a go forth this! individuals nitty-gritty chromosome count is 45 instead of 46. The carrier parent is clinically unaffected because there is no loss or nimiety of genetic material. Doctors refer to a parent interchangeable this as a balanced... If you want to get a wide essay, order it on our website: BestEssayCheap.com

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