There is a 25% probability that the first child born to this couple will be a boy who is colorblind.
There is a 50% chance that every child (unspecified gender) will have normal vision.
The X chromosome is where the genes that might cause red-green color blindness are handed down.
More males than women have red-green color blindness. This is due to:
The sole X chromosome that males inherit from their mother is. They will suffer red-green color blindness if that X chromosome carries the red-green color blindness gene rather than a normal X chromosome.
Two X chromosomes, one from the mother and one from the father, are present in females. The gene for red-green color blindness must be present on both X chromosomes in order to have the condition.
Both men and women are equally affected by blue-yellow color blindness and full color blindness, which are inherited on other chromosomes.
Learn more about color blindness here:
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