Phenylketonuria (PKU) is an autosomal recessive disease in which individuals with PKU cannot metabolize phenylalanine. A diet rich in phenylalanine can result in severe mental retardation if not caught early and the ingestion of the amino acid avoided. The occurrence of new alleles causing PKU in a Korean population that has PKU is 4 out of 33 and the frequency of the disease is 1 in 10,000 in the general population (Lee et al. 2008). What is the mutation rate of PKU in this popula

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