... on twins of the same gender. This study can be characterised in two different areas: The Biological Theory, throughout this theory theorists believe that human development is determined by our genes (Matlin, 1999). Our personalities are a combination of specific traits that range from situation to situation. Beginning with the cardinal trait that dominates a person's behavior, next is the central trait which is a general characteristic that we all have such as; happiness or being shy. The last trait being the secondary trait, which is only visible in certain situations, such as being scared of heights (Matlin, 1999). Sigelman et al (2003) states that all these traits are identically correlated in identical twins. However what I intend to investigate is can these traits be altered if twins are raised in different environments. My next theory is the Social Learning Theory, Weiten (2001) stated that theorists believe personality is largely shaped through learning and ...

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