Twin and adoption studies have demonstrated that
A) there is no genetic component to temperament.
B) temperament is entirely due to genetic factors.
C) identical twins are more similar than are fraternal twins on many aspects of temperament.
D) stepsiblings are more similar than are biological siblings on many aspects of personality.

Question

Quizplus · Accepted Answer

Twin and adoption studies have consistently shown that identical twins are more similar in temperament than fraternal twins, indicating a strong genetic component to temperament. However, this does not mean that temperament is entirely due to genetic factors (eliminating B). Studies have also shown that adoptive siblings are more similar in personality than unrelated individuals, but not as similar as biological siblings (eliminating D). Option A is incorrect because twin and adoption studies clearly indicate that genetics play a role in temperament.

Twin and Adoption Studies Have Demonstrated That