Even though a child's parents both have the recessive gene for phenylketonuria,the child only has a 25% chance of inheriting the disorder.

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If both parents carry the recessive gene for phenylketonuria, there is a 25% chance for each child to inherit two copies of the recessive gene (one from each parent) and thus have the disorder, a 50% chance to be a carrier like the parents, and a 25% chance to inherit two dominant genes, not having the disorder nor being a carrier.

Even Though a Child's Parents Both Have the Recessive Gene