Over the years there have been several studies examining what is called the "Nature vs. Nurture" question. These studies looked at different characteristics of the person from intelligence, personality, interests, social issues and biology. Although most agree that the answer to this question is not one relative to the other, but rather it is a combination of the two that makes us who we are. Several studies have shown this, but there are some aspects of our person on which one has a greater influence than the other. Hopwood et al., (2011) suggest that our personality as we grow and mature is more influenced by our environment than our genes. This article examines the effects of research by Hopwood et al. compared to the research of Bouchard, Lykken, McGue, Segal and Tellegen on this topic. The research by Hopwood et al. (2011) examined our personality and how it develops from late adolescence (age 17) to young adulthood (age 29). The research participants were same-sex MZ twins or DZ twins who responded to the Multidimensional Personality Questionnaire (MPQ). This allowed the researcher to study four main personality traits: negative emotionality or neuroticism (NEM), positive emotionality or agentic extraversion (PEM-A), positive emotionality or communal agreeableness (PEM-C), and constraint (CON) (as situated in Hopwood, 2011, p. Significant changes in NEM and CON were reported while CON increased as participants aged and little change was recorded in PEM traits there was a significant change in the development of NEM and CON compared to PEM. The results were divided into three categories, genetic, sha...... middle of paper ......gen, A. (1990 ) Sources of human psychological differences: The Minnesota study of twins reared apart psychology, 56, 453–484. doi:10.1146/annurev.psych.55.090902.141913 Clark, L. A., & Watson, D. (2008). Temperament: An organizational paradigm for trait psychology. In O.P.John, R.W.Robins, & L.A.Pervin (Eds.), Handbook of personality: Theory and research (3rd ed., pp. 265–286). New York, NY: Guilford Press.Hopwood, C.J., Donnellan, M.B., Blonigen, D.M., Krueger, R.F., McGue, M., Iacono, W.G., & Burt, S.G. (2011). Genetic and environmental influences on the stability and growth of personality traits during the transition to adulthood: A three-wave longitudinal study. Journal of Personality and Social Psychology, 100(3), 545–556.