Some forms of cataracts and deaf-dumbness in humans are autosomal recessive signs. What is the probability

Some forms of cataracts and deaf-dumbness in humans are autosomal recessive signs. What is the probability of having healthy children in a family if the parents are diheterozygous?

The probability of having healthy children in a family if the parents are diheterozygous is 9/16.

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