This structure is associated with a lysosomal storage disease caused by deficiency of alpha-galactosidase A known as Fabry's disease. The lack of the gene FMR1 on this structure can lead to mental retardation, a syndrome in which this structure is "fragile." In a process known as lyonization, one of these structures deactivates to form a Barr body, and a missing one of these structures causes Turner syndrome. Males that possess an extra copy of this structure have Klinefelter syndrome, and red-green color blindness is a recessive trait linked to this structure. For 10 
This structure is associated with a lysosomal storage disease caused by deficiency of alpha-galactosidase A known as Fabry's disease. The lack of the gene FMR1 on this structure can lead to mental retardation, a syndrome in which this structure is "fragile." In a process known as lyonization, one of these structures deactivates to form a Barr body, and a missing one of these structures causes Turner syndrome. Males that possess an extra copy of this structure have Klinefelter syndrome, and red-green color blindness is a recessive trait linked to this structure. For 10 points, name this sex chromosome of which females possess two.
This structure is associated with a lysosomal storage disease caused by deficiency of alpha-galactosidase A known as Fabry's disease.
{X} chromosome