Why are twin studies important in personality research? What have we learned about personality from such studies? Provide specific evidence to support your conclusion

What will be an ideal response?

* Twin studies allow researchers to suggest whether personality is more influenced by genetic or environmental factors.
* Correlations on certain personality measures are similar for identical twins reared apart and together; however, identical and fraternal twins also demonstrate significant differences on personality measures.
* Another study of twins concluded that there was evidence of change and stability of personality over time.
* The genetic influence upon personality rarely exceeds 50 percent and researchers note at least half the personality dimensions are not shared by identical twins.
* Siblings who grow up in the same family can be very different, thus the importance of the nonshared environment is evident.