For 10 points, name this human sex chromosome that most females have two of and most males have one of, which is contrasted with the Y chromosome.
One mutation associated with this structure can cause hypohidrotic ectodermal dysplasia, a condition in which sweat glands do not properly develop. Another mutation associated with this structure is the leading genetic cause of mental retardation. This structure can be Lyonized, or (*) inactivated to form a Barr body, and some individuals with only one of this chromosome have Turner syndrome. Mutations of genes on this chromosome can result in color blindness, hemophilia, and its namesake "fragile" syndrome. For 10 points, name this human sex chromosome that most females have two of and most males have one of, which is contrasted with the Y chromosome.
One mutation associated with this structure can cause hypohidrotic ectodermal dysplasia, a condition in which sweat glands do not properly develop.
X chromosome