There is a 50% probability that the son is red-green colorblind and 50% chance that the sons do not have the gene and will be healthy. There is a 50% chance that a son will inherit the gene and show the trait or disorder.
Red-green colorblindness is an X-linked recessive trait in humans and in this a person cannot distinguish between red and green color but their eye sight is normal. However, males are affected more than females, because the gene is present on the X chromosome. So there is a 50% chance that the son is colorblind. Males are affected more than females because the gene is located on the X chromosome.
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