In an Experiment It Was Found That Newborn Rats Who

question 192

Multiple Choice

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 adult rats when raised by genetically unrelated, attentive mothers. Although the rats' DNA did not change, the chemicals that controlled their gene expression did change, a phenomenon called:

• A)epigenetic change.
• B)allele variation.
• C)recessive gene mutation.
• D)dominant gene mutation.

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