Down Syndrome

discomfit Syndrome I.Standard Trisomy 21 A. Meiotic Non-disjunction Event B.Meiotic Disjunction 1.90% and 95% of all cases of Down syndrome has Trisomy 21. A someone with Trisomy 21 has terce copies of chromosome 21 (instead of the usual two copies) in every cadre of his or her body. a. Down Syndrome is the most commonly occurring chromosomal abnormality, resulting when an item-by-item possesses three, rather than the usual two, copies of 21st chromosome. This excess genetic poppycock affects a persons physical and cognitive development. b.In this case it does not go by properly and one stall may comprise 22 chromosomes and the other may contain 24 chromosomes. II.Translocation Trisomy 21 A.Balanced Translocation B.Whilst Down syndrome 1.Approximately 3% to 4% of individuals with Down syndrome do not inherit an entire extra chromosome 21, hardly just some extra chromosome 21 genes, which be attached to another chromosome (usually chromosome 14). a.Occasionally the extra copy of chromosome 21 is attached to another chromosome in the egg or spermatozoon and this may result. b.A parent has exactly two copies of chromosome 21, but some of the genes are distributed to another chromosome. 2.What Are the Characteristics of Down syndrome? a.

near as newborn babies of differing nationalities or races have visible distinguishing features, so do babies with Down syndrome. b. There are many characteristics associated with Down syndrome, including low muscle tone, a flat facial profile, and an increase risk of some related medical conditions. III.Mosaic Trisomy 21 A. How does this happen? B.Is Down syndrome inherited? 1. During cellular phone division to create a germ cell (either sperm or egg), a cell containing 46 chromosomes divides into two germ cells each containing 23 chromosomes. a. The person received 46 chromosomes at fertilization but someplace during early cell division the chromosome 21 cell pairs failed to take apart creating... If you want to get a full essay, order it on our website: Ordercustompaper.com

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