Yasser’s color-blindness is likely linked to deficiencies in one or more types of cones (the most common form in males is a deficiency in red- and green-sensitive cones. the normal functioning of these cones, as described by the young-helmholtz trichromatic theory, explains how humans are able to perceive a wide variety of colors from differential activation of red-, green-, and blue-sensitive cones.

Yasser’s color-blindness is likely linked to deficiencies in one or more types of cones (the most common form in males is a deficiency in red- and green-sensitive cones. As described by the Young-Helmholtz trichromatic theory, the differential activation the three types of cones are each receptive to one of the colors.

Explanation:

Based on the work and research of Thomas Young and Hermann von Helmholtz in the 19th century, the resulting findings is know as the Young–Helmholtz theory, or trichromatic color vision, stating the existence of three different kinds of photoreceptors system which allows the phenomenon of detectings assorted colors. These cone cells in the eye are sensitive to a particular range of visible light and, in 1850 Hermann von Helmholtz developed the theory further stating that the three types of cone photoreceptors could be classified as short-preferring (violet), middle-preferring (green), and long-preferring (red), according to their response to the wavelengths of light striking the retina. The relative strengths of the signals detected by the three types of cones are interpreted by the brain as a visible color.

answer; overt behavior;