There are three types of Down’s Syndrome: Trisomy 21, Translocation, and Mosaicism. Trisomy 21 is the most common type of Down’s Syndrome; it occurs in 95 percent of Down’s Syndrome cases. Trisomy 21 is a disorder in which a newborn receives an extra third chromosome-21, instead of the normal 2. The second type of Down’s Syndrome is Translocation; it occurs when only a small piece of the chromosome-21 is found on another chromosome. Only 3 percent of those with Down’s Syndrome suffer from Translocation. Mosaicism is the third type of Down’s Syndrome and also the rarest; it is a disorder in which newborns have a mix of cells in the chromosome-47 that contains an extra chromosome-21. Only 2 percent of people with Down’s Syndrome possess Mosaicism. (Hauser-Cram, 15)
Causes of Down’s Syndrome are still unknown. There is no way to prevent the occurrence of Down’s Syndrome,...
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Hauser-Cram, Penny. Children with Disabilities: a longitudinal study of child
development and parent well-being. Boston: Blackwell, 2001.
Kumin, Libby. Classroom Language Skills for Children with Down Syndrome: A Guide
for Parents and Teachers. 1st ed. Maryland: Woodbine House, 2001.
Leshin, Dr Len. Down Syndrome: Health Issues. May 2009.
McGuire, Dennis. Mental Wellness in Adults with Down Syndrome: A Guide to
Emotional and Behavioral Strengths and Challenges. 1st ed. Maryland: Woodbine
Skallerup, Susan, ed. Babies with Down Syndrome. 3rd ed. Boston: Woodbine House,
Skotko, Brian. Fasten Your Seatbeat: A crash course on Down Syndrome for brothers
and sisters. 1st ed. Maryland: Woodbine House, 2009.
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