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How is PKU inherited?

Phenylketoneuria (PKU) affects people who inherit two copies of an altered gene from their carrier parents. Carrier parents have a one-in-four chance of having an affected child, a one-in-two chance of having a child who is an unaffected carrier and a one-in-four chance of having a child with no altered genes at all. Carriers of PKU are not affected themselves, as they have a working gene as well as an altered one.

Inheritance of PKU.
Inheritance of PKU.

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