Turners Syndrome is a genetic disorder that affects women only where there is only one X chromosome rather than two. What this means is that those affected have one 45 instead of the usual 46 chromosomes and are infertile as the ovaries have never formed. As a result they never have periods (menses, menstruation), breasts don’t develop and neither does the body hair common with the onset of puberty.
Often those who have the syndrome are smaller than others, have a sort of webbing around the neck and there may be other defects present as well. There can be some intellectual impairment, problems with the heart and also deafness. There is a less severe form of the syndrome where the second X chromosome is present but doesn’t have any genetic material.