Phenylketonuria (PKU)is an example of a phenotype that is solely influenced by genes.

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Phenylketonuria (PKU) is a genetic disorder that results from mutations in the gene responsible for producing the enzyme phenylalanine hydroxylase. However, the phenotype of PKU is also influenced by environmental factors, specifically the intake of foods containing phenylalanine. Individuals with PKU must follow a strict low-phenylalanine diet to prevent the harmful effects of excess phenylalanine on brain development. Therefore, the phenotype of PKU is a result of both genetic and environmental factors.

Phenylketonuria (PKU)is an Example of a Phenotype That Is Solely