Which of the following is evidence that personality has a genetic component?
A) Adopted children in the same family are similar in personality.
B) Identical twins are more similar in personality than nonidentical twins.
C) People in the same culture are similar in personality.
D) Both biological and nonbiological siblings show similar personalities.

Question

Quizplus · Accepted Answer

The fact that identical twins are more similar in personality than nonidentical twins suggests that there is a genetic component to personality, since identical twins have the same genetic material while nonidentical twins do not. The other options do not necessarily provide evidence for a genetic component. Option A could also be explained by shared environmental factors, such as growing up in the same household. Option C could be explained by cultural influences. Option D could be influenced by shared environmental factors, such as growing up together, rather than genetics.

Which of the Following Is Evidence That Personality Has a Genetic