The X chromosome represents approximately 5% of the total DNA in cells.
|Summary:||Gene examples of chromosome X:|
|The genes OPN1LW and OPN1MW encodes long-wavelength- and middle-wavelength-sensitive photopigments in the cones (specialized cells for the detection of light and color) of the retina (a light-sensitive tissue that lines the back of the eye). Mutations in these genes cause colour vision deficiency.||The F8 gene carries instructions for the coagulation factor VIII, which is required for normal blood clotting. Defects in this gene results in hemophilia A (blood clots can't form properly in response to injury, leading to excessive bleeding).|