a woman with normal vision whose father was color blind marries a man with normal vision whose father was also color blind. The proportion of their sons will be colorblind is 1/2.
Color blindness is the inability to see color differences or differences in color. It can make it difficult to select ripe fruit, choose clothing, and read traffic lights. The mother's sons will be colorblind if the gene is passed down to them. A colorblind man will pass on an X-linked recessive gene to all of his daughters. The daughter will then be a carrier and will not be colorblind. A daughter can only be colorblind if both her mother and father are colorblind and pass the gene down to her. This is why men are more affected by color blindness than women.
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