Down Syndrome Report The chromosomal abnormality involved in most cases of Down syndrome is trisomy-21, or the presence of three copies of the 21st chromosome. As a result, the affected person has 47 chromosomes in all body cells instead of the normal 46, although how this causes the condition's symptoms is not yet known. Scientists assume that the reason for the abnormal chromosomal assortment is the fertilization of an ovum having 24 chromosomes by a sperm with a normal assortment of 23, but they have also found that the sperm can carry the extra chromosome as well. The abnormal ovum or sperm is derived from a germ cell in which th....

Words In Essay: 430 Approximate Pages: 2

You are just minutes away from instant access to viewing this paper along with over 35,000 other essays and term papers. What are you waiting for? That paper isn't going to write itself. Join today and get a ton of help with that paper! Membership Options Price Recurring 1 month  subscription $17.95 Y 3 months subscription $34.95 Y 6 months subscription $59.95 N