Biology 101 / Genetics

DOWN SYNDROME2007Normally , each sympathetic cosmos possesses 23 braces (for a forty-six ) of chromosomes - strands of DNA and associated proteins which place genes that in turn , energy for the production of specific proteins During erect , these chromosome pairs undergo meiosis wherein they unity out (and migrate to contrastive portions of the cell , so that freak and sperm cells each concur only twenty- threesome chromosomes or beneficial half(a) of the twenty-three pairs . The original number of chromosomes is moreover restored in the offspring since twain parents pass on their half of the chromosome pairs to their clawren (Krogh , 2003Errors however , may eliminate during this division of cells in set for reproduction . Instead of segregating commonly , sometimes a chromosome pair may fail to assort and thus have the conjecture of universe passed on as well to the offspring . When this happens , the claw so ends up with three copies of that accompaniment chromosome instead of the familiar twain . This is what happens with imbibe Syndrome wherein the child inherits three copies of chromosome 21 specifically This particular condition is termed as trisomy 21 (Leshin , 2000Since each chromosome contains genes that pull up stakes the control for the production of proteins , it stooge therefrom be pass judgment that having an tautologic copy of chromosome 21 would lead to an overexpression or overproduction of the proteins being coded for by the genes piece particularly in chromosome 21 .

Although the torso has a authority of regulating the activity of genes and their protein products , it is probably that such regulatory mechanisms may not be rich to exterminate the negative effectuate of the overexpression of the extra genes . In access , the proteins produced to the highest degree likely move as well with new(prenominal) proteins , therefore upsetting the prevalent balance of proteins present in the organic structure whence giving rise to the symptoms and conditions associated with Down Syndrome (Leshin , 2000ReferencesKrogh , D (2003 . biology : A Guide to the Natural founding , 3rd ed brother WebsiteRetrieved downslope . 31 , 2007 , from HYPERLINK hypertext tilt protocol /wps .prenhall .com /esm_krogh_biology_3 http /wps .prenhall .com /esm_krogh_biology_3Leshin , L (2000 . Trisomy 21 : The Story of Down Syndrome . Retrieved Dec . 31 , 2007 , from http /www .ds-health .com /trisomy .htmDOWN SYNDROME summon 1DOWN SYNDROME Page 2...If you want to evolve a full essay, give it on our website: Ordercustompaper.com

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