Jered was adopted as an infant in 1973. Jered has an identical twin who was also adopted in 1973 but by a different family. As an adult, Jered’s personality should most resemble that of:

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Jered was adopted as an infant in 1973. Jered has an identical twin who was also adopted in 1973 but by a different family. As an adult, Jered’s personality should most resemble that of:

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Jered’s question involves nature versus nurture in personality development and the degree to which genetics influence resemblance in adulthood.
Option 1: 'his identical twin.' This option aligns with evidence from behavioral genetics that identical twins share nearly all their genes, which often leads to greater similarity in personality traits than between non-identical relatives, even when raised apart. Since the twins were adopted into different families, the shared genetics provide a strong basis for similarity in personality.
Option 2: 'a sibling in his adoptive family.' While there can be some personality similarities with adoptive siblings due to shared environments and experiences, these siblings do not share the same genetic makeup as Jered, so this option does not account for the substantial heritable component of personality.
Option 3: 'one or both of his adoptive parents.' Adoptive parents contribute to the environmental shaping of personality, but the genetic influence from Jered’s own biological parents is absent in adoptive parent–child comparisons. Therefore, while shaping factors exist, this option underestimates the genetic contribution and overemphasizes direct parental influence from the environment Jered was raised in.
Option 4: 'one or both of his biological parents.' Although biological parents provide genetic material that shapes personality, the question emphasizes adult resemblance in a context where Jered has been raised in a different environment from his biological parents due to adoption. Environmental effects from the adoptive family can modify expression of traits, and while biology matters, the strongest expected similarity in this scenario would come from the twin who shares both genetics and, to some extent, developmental history prior to adoption. However, since the twins were raised apart, the direct environmental alignment with biological parents is not as strong a predictor as genetic similarity with the identical twin.

PSYCH FUNDAMENTALS C Exam 2- Requires Respondus LockDown Browser

Jered was adopted as an infant in 1973. Jered has an identical twin who was also adopted in 1973 but by a different family. As an adult, Jered’s personality should most resemble that of:

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