tell me abot turners syndrome
Answers
Turner syndrome is a chromosomal condition that affects development in females. The most common feature of Turner syndrome is short stature, which becomes evident by about age 5. An early loss of ovarian function (ovarian hypofunction or premature ovarian failure) is also very common. The ovaries develop normally at first, but egg cells (oocytes) usually die prematurely and most ovarian tissue degenerates before birth. Many affected girls do not undergo puberty unless they receive hormone therapy, and most are unable to conceive (infertile). A small percentage of females with Turner syndrome retain normal ovarian function through young adulthood.
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Turner syndrome is the result of a chromosomal abnormality.
Usually, a person has 46 chromosomes in each cell, divided into 23 pairs, which includes two sex chromosomes. Half of the chromosomes are inherited from the father and the other half from the mother. The chromosomes contain genes, which determine an individual's characteristics, such as eye color and height. Girls typically have two X chromosomes (or XX), but girls with Turner syndrome have only one X chromosome or are missing part of one X chromosome.
Turner syndrome is not caused by anything a girl's parents did or did not do. The disorder is a random error in cell division that happens when a parent's reproductive cells are being formed.
Girls born with the X condition in only some of their cells have mosaic Turner syndrome. Often, their signs and symptoms are milder than those of other girls with the X condition.
The condition is named for Dr. Henry Turner, an endocrinologist, who in 1956 noted a set of common physical features in some of his female patients.
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