In the context of hereditary color vision deficiencies, which genetic factor is most often implicated in the inability to distinguish any colors?

• A. Defects in the photoreceptor cells in the fovea
• B. Mutations in the bipolar cells of the retina
• C. Genetic anomalies in the ganglion cells
• D. Mutations in the genes associated with cone photoreceptor function

Answer: (D)