Turner syndrome TS , also known 45,X , or 45,X0 , is a genetic condition in which a female is partly or completely missing an X chromosome. Turner syndrome is not usually inherited ; rather, it occurs as a result of a genetic defect arising during formation of the reproductive cells in a parent or in early cell division during development. No cure for Turner syndrome is known. Turner syndrome occurs in between one in 2,  and one in 5, females at birth. Of the following common symptoms of Turner syndrome, an individual may have any combination of symptoms and is unlikely to have all symptoms.
Disorders of the sex chromosome like disorders of the autosomes can be either numerical or structural, and can be present in all cells or in a mosaic form. Clinical indications that should raise suspicions of a sex chromosome abnormality are:. These disorders are considered very common with incidence of about — Phenotypes associated with sex chromosome disorders are less severe than autosomal defects and this is mainly due to X chromosome inactivation , as well as the fact that Y chromosomes have a low gene content.
Turner syndrome TS is a genetic condition found in females only. It affects about 1 in every 2, girls. Girls with Turner syndrome are usually shorter than their peers. The good news is that if TS is diagnosed while a girl is still growing, she can be treated with growth hormones to help her grow taller.
Sex Chromosome Abnormalities. The majority of known types of chromosomal abnormalities involve sex chromosomes. In frequency of occurrence, they are only slightly less common than autosomal abnormalities. However, they are usually much less severe in their effects. The high frequency of people with sex chromosome aberrations is partly due to the fact that they are rarely lethal conditions.