Fragile X syndrome is caused by a mutated gene on the X chromosome. Affected individuals have developmental delays, variable levels of mental retardation, and behavioral and emotional problems. They may also have characteristic physical traits. Males are affected more severely than females.

Klinfelter syndrome is a genetic disorder affecting males. People with this syndrome are born with at least one extra X chromosome.

Turner syndrome is a disorder of the chromosomes affecting females, where one of the two X chromosomes is partially or completely absent.

Chromosomes are found in every cell in the body. Chromosomes contain genes, structures that direct the growth and functioning of all the cells and systems in the body. In other words, chromosomes are responsible for passing on hereditary traits from parents to child, like eye color, height, nose shape, etc. Chromosomes also determine whether the child will be male...