Turner's syndrome arises from an abnormal number of this molecular structure, and disorders such as red-green color blindness and hemophilia arise from recessive alleles on this structure.
In a disorder involving this structure, the loss of a namesake mental retardation protein prevents synapse maturation between neurons. Genetic imprinting plays a role in the deactivation of those that are paternally derived, which results in the condensation of this structure into a dark-staining Barr body. Turner's syndrome arises from an abnormal number of this molecular structure, and disorders such as red-green color blindness and hemophilia arise from recessive alleles on this structure. For 10 points, name this sex chromosome that pairs with the Y chromosome in males.
In a disorder involving this structure, the loss of a namesake mental retardation protein prevents synapse maturation between neurons.
{X} chromosome