Imagine that a researcher measures a specific psychological characteristic (SPC) in pairs of siblings who are being reared together. She finds a correlation of .15 between pairs of adopted siblings who are biologically unrelated, a correlation of
63 for fraternal twins, and a correlation of .92 for identical twins. These results suggest that
A) compared to the impact of the environment, genetics contributes relatively little to variability in the SPC.
B) the shared environment contributes greatly to the variability in the SPC only among the identical twins.
C) both the environment and genetics contribute substantially to the variability in the SPC.
D) relative to the influence of genetics, the environment contributes relatively little to variability in the SPC.
D) relative to the influence of genetics, the environment contributes relatively little to variability in the SPC. Increasingly strong, positive correlations for a trait, as a function of genetic relatedness, indicate that the trait has a significant genetic component.
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Overall, about ________ of all arrests for serious crimes involved a person under the age of 18
A) 40% B) 16% C) 65% D) 7%
Radical determinism states that
A) the majority of behavior is caused by the environment. B) only a small amount of behavior is caused by the environment. C) approximately 50% of behavior is caused by the environment. D) all behavior is caused and that free will does not exist. E) no behavior is caused and free will determines all actions.