PSY 351 Chapter Notes - Chapter 10: Twin, Extraversion And Introversion, Look-Alike
Document Summary
Relatively stable abilities and aptitudes appear to have a large genetic component. Appears that both environment and culture influence adult intelligence and other cognitive abilities. Many psychological disorders appear to be affected by the genes we inherited. Members of a family not only share genes, but share living environments as well. Twin-study method - procedure for examining the role of genetics on personality in which pairs of monozygotic and dizygotic twins are compared. Monozygotic (mz) - two babies come from the same fertilized egg. Dizygotic (dz) twins - comes from different eggs. Fraternal twins, no more alike genetically than any two siblings. 40% of the stability in our adult personalities can be attributed to what we inherit from our parents. Strongest and most consistent evidence in favor of genetic influence on personality comes from twin-study research. Twin pairs can be accurately identified as mz or dz twins. Researchers assume that mz and dz twins have equally similar environments.
