Phenylketonuria is a genetic disorder, which is caused by a defect in the single gene.There are numerous effects of this disorder including mental retardation, eczema, and pigment abnormalities.That one gene affects many traits is an example of:

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Pleiotropic genes are genes that affect multiple, seemingly unrelated traits. Phenylketonuria is an example of a pleiotropic genetic disorder, as the single gene defect can cause multiple effects such as mental retardation, eczema, and pigment abnormalities.

Phenylketonuria Is a Genetic Disorder, Which Is Caused by a Defect