Twin studies most clearly indicate that ________ exert a strong influence on the development of our unique personality traits.
A) protein molecules
B) shared family environments
C) free-floating stress hormones
D) person-to-person genetic variations

Question

Quizplus · Accepted Answer

Twin studies compare the personality traits of identical and fraternal twins who were raised in the same environment. Since identical twins share 100% of their genetic material, any similarities in personality traits between them suggest that genetics play a strong role. Therefore, person-to-person genetic variations are the best choice for this question.

Twin Studies Most Clearly Indicate That ________ Exert a Strong