In an Experiment, It Was Found That Newborn Rats Who

question 202

Multiple Choice

In an experiment, it was found that newborn rats who were genetically predisposed to be calm and stress-resistant grew upto be nervous, high-strung, and easily stressed adult rats when raised by genetically unrelated, inattentive mothers. The explanation for these results was that:

• A)the rats' DNA changed because of their upbringing.
• B)epigenetic changes had taken place that changed their brain chemistry and literally "reprogrammed" their future behavior.
• C)severe genetic mutations had taken place from one generation to the next.
• D)the rats' DNA was damaged by environmental factors, such as exposure to ultraviolet light, radiation, or chemical toxins.

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