PKU (Phenylketonuria) is an autosomal recessive disorder. This means that the genetic mutation causing PKU is located on one of the non-sex chromosomes (autosomes) and both parents must carry a copy of the mutated gene for a child to be affected. If both parents are carriers, there is a 25% chance for their offspring to be affected by PKU. PKU is not an X or Y-linked genetic condition, meaning that it can affect both males and females equally.
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