In an experiment, it was found that newborn rats who were genetically predisposed to be skittish, nervous, and high-strung would develop into calm, exploratory, and stress-resistant adultrats when raised by genetically unrelated, attentive mothers.The researchers concluded that:

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The fact that the genetically predisposed rats developed into a different behavior phenotype when raised by genetically unrelated, attentive mothers indicates that the genes controlling their behavior were not mutated. Instead, it suggests that the chemical tags that control gene expression, which are influenced by environmental factors, were altered leading to changes in behavior. This is an example of epigenetic changes, which can be inherited and are reversible.

In an Experiment, It Was Found That Newborn Rats Who