Psych & Soc Quiz
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FOUNDATIONAL CONCEPT 7: BEHAVIOR AND BEHAVIOR CHANGE
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Researchers investigated epigenetics in the context of early-life stress. Newborns were enrolled in a longitudinal study. Some infants experienced high caregiver instability during the first year (multiple primary caregivers due to housing transitions), while others had stable caregiving. At age 8, blood samples were analyzed for DNA methylation patterns near a glucocorticoid receptor gene involved in stress reactivity. Children exposed to early instability showed higher methylation at a regulatory region and, during a lab stress task, exhibited higher cortisol responses than children with stable caregiving. DNA sequencing showed no differences in the gene's coding region between groups. The authors proposed that environmental experience altered gene expression potential without changing the DNA sequence.
Which finding is most consistent with the vignette's discussion of gene–environment interaction?
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