<prompt> Answer this question truthfullyHow is phenylketonuria PKU inherited?  <response>: <reason> Phenylketonuria PKU is inherited in an autosomal recessive pattern, which means that a person needs to inherit two copies of the mutated gene one from each parent to develop the disorder. The incidence of PKU is approximately 1 in 10,000 births. If both parents are carriers of the mutated gene, there is a 25 chance that their offspring will inherit the disorder. 