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| A <u>'''Trisomy'''</u> is a type of polysomy inwhich instead of the usual two chromosomes, there are three copies of a particular chromosome. A trisomy is a type of aneuploidy (an abnormal number of chromosomes).
| | See [[Trisomy|Trisomy]] |
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| The majority of human trisomies result in miscarriage, however there are a number of types that survive to birth. These include; Trisomy 13 (Patau Syndrome), Trisomy 18 (Edwards syndrome) and Trisomy 21 (Down Syndrome). Autosomal trisomy shows various levels of mental retardation and is associated with physical traits.
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| Trisomy of sex chromosomes also occurs. XXX (Triple X syndrome) and XXY (Klinefelter syndrome).
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Latest revision as of 03:09, 27 November 2013