Discussion:
Twin study
Twin research is based on the notion that if identical twins (whose genes are exactly the same) reared apart are more similar than fraternal twins or non-twin siblings (who are similar, but not identical, in genetic inheritance) reared together, heredity must be the most important influence. According to this theory, if psychological characteristics such as intelligence, emotionality and sociability were determined by heredity, identical twins would be exactly alike and researchers would find correlations of +1.00. However, studies show that correlations are less than +1.00.
1. How do you think these results can be explained? What does this tell us about the role of environment vs. heredity in the development of psychological traits?
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