The effects of PKU are epigenetic because
A) having two genes for PKU doubles the chances that phenylalanine will impact a child's brain development.
B) a child inherits two genes for PKU only when environmental conditions are favorable.
C) phenylalanine causes mental deficits even if a child inherits just one gene for PKU.
D) PKU is harmful only if a child ingests significant amounts of phenylalanine.

Question

Quizplus · Accepted Answer

PKU (Phenylketonuria) effects are considered epigenetic because the harmful effects, such as mental deficits, only manifest if the individual with the condition consumes significant amounts of phenylalanine, which is found in certain foods. This means the environment (diet in this case) interacts with the genetic condition to produce the phenotype.

The Effects of PKU Are Epigenetic Because