Can two persons with normal vision produce a colorblind son?

Yes, two persons with normal vision can produce a colorblind son.

Colorblindness, also known as color vision deficiency, is a genetic condition that affects the ability to distinguish between certain colors. The most common type of colorblindness is red-green colorblindness, which makes it difficult to see the difference between red and green.

Colorblindness is an X-linked recessive genetic trait, which means that it is carried on the X chromosome. Males are more likely to be colorblind than females because they only have one X chromosome, while females have two. If a woman carries the gene for colorblindness, she is known as a carrier. A male will only be colorblind if he inherits the gene from both his mother and his father.

Therefore, if a woman is a carrier of the gene for colorblindness and her husband has normal vision, there is a 50% chance that their son will be colorblind. If their son inherits the gene from his mother, he will be colorblind. If he inherits the gene from his father, he will have normal vision.