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).
If one parent has hemoglobin C trait and the other has normal hemoglobin, it is unlikely that any of their children will have hemoglobin C disease. However, there is a 50% chance with each pregnancy that the child will have hemoglobin C trait.