Occasionally someone claims that "if some behavioral condition is controlled by genes, then there is nothing we can do to change it." Which of the following phenomena provides the strongest, clearest evidence against that claim?

Question

Quizplus · Accepted Answer

Phenylketonuria (PKU) is a genetic condition where the body cannot break down phenylalanine, an amino acid found in many foods. PKU can lead to intellectual disability and other neurological problems if left untreated. However, a low-phenylalanine diet can effectively manage the symptoms of PKU, allowing individuals with the condition to live normal lives. This is clear evidence that even if a condition is controlled by genes, environmental factors such as diet can still have a significant impact on its expression.

Occasionally Someone Claims That "If Some Behavioral Condition Is Controlled