X-trisomy

X-trisomy

       sex chromosome disorder of human females, in which three X chromosomes are present, rather than the normal pair. More common than Turner's syndrome, where only one X chromosome is present, X-trisomy usually remains undetected because affected individuals appear normal, experience puberty, and are usually fertile. Statistical studies suggest a slightly increased frequency of mental disturbance, retardation, or both.

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Universalium. 2010.

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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 C syndrome — trisomy 8 s …   Medical dictionary

  • trisomy D syndrome — trisomy 13 s …   Medical dictionary

  • trisomy E syndrome — trisomy 18 s …   Medical dictionary

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