Answer:
The Minnesota Twin Family Study, conducted from 1979 to 1999, followed 137 pairs of identical and fraternal twins who were separated at an early age. A section of this study called the Minnesota Study of Twins Raised Apart, carried out by behavioral geneticist Thomas J. Bouchard, Jr., followed only identical twins who had 100 percent the same genes. He engaged in this study to investigate the assumption that if heredity is exactly alike, any differences must be due to environment. This study found that genetics plays a larger role on personality than previously thought. Environment affected personality when twins were raised apart, but not when they were raised together. Researchers found that an identical twin reared away from his or her co-twin had about an equal chance of being similar to the co-twin in terms of personality, interests, and attitudes as did a co-twin who had been reared with them. This led to the conclusion that similarities between twins are due to genes rather than environment.
Explanation:
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