The inheritance pattern of the disease from this example is autosomal reccesive type.
Both the mother and the father must possess the altered gene and pass it on to the offspring for PKU to be inherited. Autosomal recessive is the term used to describe this mode of inheritance. The disease must be autosomal recessive if any affected founding daughter has two unaffected parents. Both parents must possess the recessive gene in order for the affected person to inherit it the disease.
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