An individual develops intellectual disability due to a disorder called phenylketonuria (PKU). Which of the following is most likely to have occurred to cause intellectual disability?

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PKU is a disorder that prevents the normal breakdown of phenylalanine, leading to its accumulation in the bloodstream and brain. This, in turn, leads to the inhibition of normal myelin development in the brain, which can cause intellectual disability. Myelin is important for efficient neural communication, and without it, nerve impulses can't travel as quickly or efficiently, leading to cognitive deficits.

An Individual Develops Intellectual Disability Due to a Disorder Called