University of Texas, Rio Grande Valley PSY 4333 CHAPTER TEN QUIZ 1)Research on twins indicates what percentage of our adult personalities is determined by genetics?   Which statement about extraverts, introverts, and stimulation is true?   Which statement about genetic influence on personality traits is true?     What is a major criticism of research focusing on identical twins who were separated at birth and adopted into different families?   An introvert is most likely to choose which kind of public study area?     If you are a researcher designing a twin study to test the efficacy of the biological approach to personality, which participants should you choose in order to yield the most convincing results?   How does extraversion affect happiness?   What is one problem with studies of twins to investigate the heritability of personality traits?     Research on twins shows that____   Research indicates that extraversion___________