Which statement is TRUE regarding inherited deficiencies of color vision?
A) They affect females much more frequently than males.
B) The lack of M-cones and L-cones is due to a defect on the X chromosome.
C) They occur when a person is born without rods in the retina.
D) There are two categories of these deficiencies-night blindness and trichromacy.

Question

Quizplus · Accepted Answer

Inherited deficiencies of color vision, such as red-green color blindness, are often due to defects on the X chromosome. Since males have only one X chromosome, a defect on their single X chromosome will result in color vision deficiency. Females have two X chromosomes, so a defect would have to be present on both of their X chromosomes for them to exhibit the deficiency, making it less common in females. The lack of M-cones (medium wavelength cones) and L-cones (long wavelength cones) is a common cause of red-green color blindness, which is linked to the X chromosome.

Which Statement Is TRUE Regarding Inherited Deficiencies of Color Vision