Trisomy: Difference between revisions
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Trisomy is where there is an extra of a particular chromosome due to nondisjunction during meiosis. Trisomy often leads to miscarriage although there are a number of chromosomal abnormalities in which the foetus survives, mainly 13, 18, 21, X and Y. The chance of trisomy occuring increases with the age of the mother. | Trisomy is where there is an extra of a particular [https://bms.ncl.ac.uk/wiki/index.php/Chromosome chromosome] due to nondisjunction during meiosis. Trisomy often leads to miscarriage although there are a number of chromosomal abnormalities in which the foetus survives, mainly 13, 18, 21, X and Y. The chance of trisomy occuring increases with the age of the mother. | ||
Main non-lethal trisomies in humans: | Main non-lethal trisomies in humans: | ||
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18- Edward's Syndrome | 18- Edward's Syndrome | ||
21-[https://bms.ncl.ac.uk/wiki/index.php/Down%27s_syndrome Down's Syndrome] | 21-[https://bms.ncl.ac.uk/wiki/index.php/Down%27s_syndrome Down's Syndrome] | ||
X- Triplo x or Trisomy X | X- Triplo x or Trisomy X | ||
Revision as of 18:23, 1 December 2011
Trisomy is where there is an extra of a particular chromosome due to nondisjunction during meiosis. Trisomy often leads to miscarriage although there are a number of chromosomal abnormalities in which the foetus survives, mainly 13, 18, 21, X and Y. The chance of trisomy occuring increases with the age of the mother.
Main non-lethal trisomies in humans:
13- Patau Syndrome
18- Edward's Syndrome
X- Triplo x or Trisomy X
Y- Klinefelter
Occassionally you can also get a tetrasomy in which there are four copies of a chromosome insteasd of two.
http://downsyndrome.about.com/od/whatcausesdownsyndrome/a/othtrisomies_ro.htm