Turner Syndrome is associated with one functional X chromosome, which can arise in a number of situations.
Turner Syndrome is usually not inherited (most women with Turner Syndrome are infertile), with most cases arising from a random event affecting the reproductive cells in a parent.
Genetic scenarios:
(1) monosomy X (XO)
(2) one nonfunctional X chromosome
(3) mosaicism
Nonfunctional X chromosome may involve:
(1) isochromosome Xq
(2) ring X chromosome
(3) Xp or Xq deletion
Mosaicism (some cells have XX and others do not):
(1) with Y chromosome
(2) with monosomy X
(3) with nonfunctional X chromosome
Associations:
(1) mosaicism with a Y chromosome is associated with gonadoblastoma
(2) Xp deletions can be inherited
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