Which of the following persons would be most likely to have...

Which of the following persons would be most likely to have similar IQ test scores?
a. identical twins raised apart
b. identical twins raised together
c. fraternal twins raised apart
d. brothers and sisters from the same parents

Key Concepts

Genotype-Environment Interaction

Genotype-environment interaction examines how different environments can affect the expression of genetic predispositions. In the context of IQ, even individuals with identical genetic makeup might show variations in intelligence scores if they are raised in markedly different environments, although those raised together tend to have more similar outcomes.

Shared Environment

The shared environment encompasses the non-genetic factors that individuals raised in the same household experience, such as socioeconomic status, education, and parenting styles. This concept highlights how an identical genetic background, when combined with a similar environment, can lead to more closely aligned IQ scores.

Twin Studies

Twin studies are a key research method used in behavioral genetics to disentangle the effects of genetics and environment on various traits. By comparing identical twins, who share nearly all of their genes, with fraternal twins, who share about half, researchers can estimate the relative contributions of genetic and environmental factors to IQ.

Heritability

Heritability refers to the proportion of observed differences in a trait, such as IQ, that can be attributed to inherited genetic factors rather than environmental influences. This concept is fundamental in understanding why individuals with similar genetic makeup, like identical twins, tend to have more similar IQ scores.

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