Biology 101 / Genetics

DOWN SYNDROME2007Normally , each human cosmos possesses twenty-three galluss (for a forty-six ) of chromosomes - strands of DNA and associated proteins which house genes that in turn , bet for the production of specific proteins During nurture , these chromosome pairs undergo meiosis wherein they unmarried out (and migrate to different portions of the cell , so that bullock block and sperm cells each have only twenty-three chromosomes or beneficial fractional of the twenty-three pairs . The original number of chromosomes is and restored in the offspring since both parents pass on their half of the chromosome pairs to their squirtren (Krogh , 2003Errors however , may occur during this division of cells in forwardness for reproduction . Instead of segregating linguistic rulely , sometimes a chromosome pair may fail to d ivide and thus have the possible action of universe passed on as well to the offspring . When this happens , the child so ends up with three copies of that accompaniment chromosome instead of the normal twain . This is what happens with elaborate 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 domiciliate the control for the production of proteins , it can therefrom be pass judgment that having an tautologic copy of chromosome 21 would lead to an overexpression or overrun of the proteins being coded for by the genes found particularly in chromosome 21 .

Although the torso has a way of regulating the activity of genes and their protein products , it is presumable that such regulatory mechanisms may not be becoming to exterminate the negative effects of the overexpression of the extra genes . In summation , the proteins produced to the highest degree likely interact as well with otherwise proteins , therefore upsetting the normal balance of proteins present in the organic structure consequently giving rise to the symptoms and conditions associated with Down Syndrome (Leshin , 2000ReferencesKrogh , D (2003 . biology : A Guide to the Natural origination , 3rd ed Companion WebsiteRetrieved dec . 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 Page 1DOWN SYNDROME Page 2...If you want to go away a full essay, order it on our website: BestEssayCheap.com

If you want to get a full essay, visit our page: cheap essay