A trisomy is a type of polysomy in which there are three instances of a particular chromosome, instead of the normal two. A trisomy is a type of Aneuploidy. (http://en.wikipedia.org/wiki/Trisomy)

The most common types of human trisomy

• Autosomal
  • Trisomy 8 (Warkany syndrome)
  • Trisomy 9
  • Trisomy 13 (Patau syndrome)
  • Trisomy 18 (Edward syndrome)
  • Trisomy 21 (Down syndrome)
  • Trisomy 22
• Sex chromosomal
  • XXX (Triple X syndrome)
  • XXY (Klinefelter syndrome)
  • XYY

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