Because identical twins share 100% of their genes and fraternal twins share (on average) 50% of their genes

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Question restatement: The prompt notes that identical twins share 100% of their genes and fraternal twins share about 50% on average, and asks which statement correctly reflects what twin studies allow us to do in behavioral genetics.
Option 1: 'behavioral geneticists can disentangle the influences of genetics and the environment by studying twins.' This is accurate because twin studies leverage the genetic similarity of identical twins versus the partial genetic similarity of fraternal twins to separate genetic and environmental contributions to traits, allowing estimates of heritability and environmental effects.
Option 2: 'scientists are unable to evaluate the role of the environment with twin studies.' This is misleading. While there are limitations, twin designs are specifically used to infer environmental influences by comparing identical and fraternal pairs; saying environment cannot be evaluated is incorrect.
Option 3: 'it is impossible to study identical twins.' This is factually false; identical twins are precisely the subjects of classic twin studies, and many insights rely on comparing them.
Option 4: 'identical twins are always more similar to one another than are fraternal twins.' While this is often true for many traits, the statement is not a general methodological claim about what twin studies can do; differences in similarity can vary by trait and do not itself explain the primary use of twin designs to disentangle genetics and environment.
In summary, the first option accurately captures the core purpose of twin studies in behavioral genetics, whereas the other choices either misstate capabilities, deny a central method, or overgeneralize similarity unless a trait-specific context is considered.

Because identical twins share 100% of their genes and fraternal twins share (on average) 50% of their genes

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