trisomy


trisomy
The state of an individual or cell with an extra chromosome instead of the normal pair of homologous chromosomes; in humans, the state of a cell containing 47 normal chromosomes.For various types of t. syndrome, see under syndrome. [tri- + (chromo)some]

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tri·so·my 'trī-.sō-mē n, pl -mies the condition (as in Down syndrome) of having one or a few chromosomes triploid in an otherwise diploid set

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n.
a condition in which there is one extra chromosome present in each cell in addition to the normal (diploid) chromosome set. A number of chromosome disorders are due to trisomy, including Down's syndrome and Klinefelter's syndrome.
trisomic adj.

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tri·so·my (triґso-me) [tri + Gr. sōma body] the presence of an extra chromosome of one type in an otherwise diploid cell (2n +1). See specific trisomy syndromes under syndrome. trisomic adj

Medical dictionary. 2011.

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  • Trisomy 9 — is a chromosomal disorder caused by having three copies (trisomy) of chromosome number 9. It can appear with or without mosaicism. ymptomsSymptoms vary, but usually result in dysmorphisms in the skull, nervous system, and mental retardation.… …   Wikipedia

  • Trisomy 16 — is a chromosomal abnormality in which there are three copies of chromosome 16 rather than two. [cite web|author=Mary Kugler, R.N. |date=2005 08 20 |url=http://rarediseases.about.com/od/chrosomedisorders/a/082104.htm |title=Chromosome 16 Disorders …   Wikipedia

  • trisomy 13 — n. The condition of having three copies of chromosome 13 that results in a syndrome characterized by mental retardation and defects to the central nervous system and heart. * * * also called  Patau s Syndrome,        human chromosomal disorder… …   Universalium

  • trisomy 13 — thər(t) tēn n a congenital condition that is characterized esp. by usu. severe mental retardation and by craniofacial, cardiac, ocular, and cerebral abnormalities, is caused by trisomy of the human chromosome numbered 13, and is typically fatal… …   Medical dictionary

  • trisomy 18 — ā(t) tēn n a congenital condition that is characterized esp. by mental retardation and by craniofacial, cardiac, gastrointestinal, and genitourinary abnormalities, is caused by trisomy of the human chromosome numbered 18, and is typically fatal… …   Medical dictionary

  • trisomy — trisomy. См. трисомия. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • trisomy 21 — n. See Down syndrome. * * * …   Universalium

  • trisomy 21 — twent ē wən n DOWN SYNDROME …   Medical dictionary

  • trisomy — 1930, from trisomic (1921), from TRI (Cf. tri ) + ending from CHROMOSOME (Cf. chromosome) …   Etymology dictionary

  • Trisomy — ICD9 = ICDO = OMIM = MedlinePlus = eMedicineSubj = eMedicineTopic = MeshID = D014314A trisomy is a form of aneuploidy with the presence of three copies, instead of the normal two, of a particular chromosome.cite web… …   Wikipedia

  • trisomy-21 — Down syndrome Down syn drome, Down s syndrome Down s syn drome, n. (Med.) A congenital disorder caused by an extra chromosome 21 in some or all cells. It causes a variable number and degree of abnormalities, including retarded growth, mental… …   The Collaborative International Dictionary of English