Which of the following is evidence against the view that inherited characteristics are unmodifiable?

A) sex differences in the frequency of color-blindness
B) effects of practice on the ability of humans to curl their tongues lengthwise
C) amount of mobility shown by young gulls vs. young kittiwakes before they can fly
D) the ability of a special diet to prevent mental retardation in children with PKU

Question

Neeraj Kumar · Accepted Answer

Final Answer : D, Explanation :  The ability of a special diet to prevent mental retardation in children with PKU is evidence that inherited characteristics can be modified or prevented through environmental factors such as diet. Children with PKU inherit a genetic mutation that prevents them from metabolizing phenylalanine, an amino acid found in many foods. The special diet restricts phenylalanine intake, allowing children with PKU to develop normally without mental retardation. This demonstrates that inherited characteristics are not always fixed and unmodifiable.

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