Glossary of Medical and Health Terms

Turner Syndrome

Turner syndrome or Ullrich-Turner syndrome encompasses several chromosomal conditions, of which monosomy X is the most common. It occurs in about 1 out of every 2500 female births. Some sources say 1 out of every 5000. Instead of the normal XX sex chromosomes for a female, only one X chromosome is present and fully functional. In rarer cases a second X chromosome is present but abnormal, while others with the condition have some cells with a second X and other cells without it. A normal female karyotype is labeled 46,XX; individuals with Turner syndrome are 45,X0. In Turner syndrome, female sexual characteristics are present but generally underdeveloped.

Source: http://en.wikipedia.org/wiki/Turner_syndrome

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