As reported in the textbook, research demonstrating a genetic influence on a person's level of extraversion- introversion comes primarily from research
A) using the twin-study method.
B) comparing adopted children and biological children to their parents.
C) comparing strength of relationship with similarity of personality scores.
D) comparing adopted children's personalities with the personalities of their biological parents.

Question

Quizplus · Accepted Answer

According to the textbook, research demonstrating a genetic influence on a person's level of extraversion-introversion comes primarily from twin studies, which compare the similarity of personality traits in monozygotic (identical) twins and dizygotic (fraternal) twins. This allows researchers to estimate the heritability, or proportion of variance in a trait that is due to genetic factors, of extraversion-introversion.

As Reported in the Textbook, Research Demonstrating a Genetic Influence