A property professional with nearly 20 years experience of estate agency in Suffolk and North Essex. During that time I have carried out market appraisals on over 5000 residential properties and have helped over 1500 people successfully sell their home.
Therefore, a son from a color-blind mother (who receives the trait from his mother on the X-chromosome) will always be color-blind, regardless of the state of the father (who can only give his son a Y-chromosome).
Humans have trichromatic vision, meaning that three pigment cones blend together to create the colors people see. Pigs and other mammals have dichromatic vision, or only two pigment cones that create colors. This means a pig's view of the world is less rich than a person's, but that a pig can still differentiate colors. Animals with monochromatic vision have only one pigment cone and see in black and white.