There are two forms of blindness in humans that are inherited as recessive traits. What is the probability of a sighted person being born

There are two forms of blindness in humans that are inherited as recessive traits. What is the probability of a sighted person being born if his parents are blind, but their blindness is caused by different genes, and they are heterozygous for a different gene?

The probability of having a sighted child is 1/4.

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