1. Genetics

2. Nature vs. Nurture

3. Methodology
Twin studies
Adoption studies

4. Minnesota twin study, Bouchard et al. (combo)
identical twins more similar than fraternal

5. Temperaments
Buss & Plomin
Emotionality
Sociability
Activity level

6. Interaction of Nature & Nurture
Environment effects genes
PKU
MAO and antisocial behavior
In males:
Low genotype + maltreatment  antisocial beh.
High genotype no inc. antisocial beh even with maltreatment
Low genotype without maltreat.  slight inc, but not significant

7. Genes effect environment
Examples:
Emotionality and attachment
Physical attractiveness and self-esteem

8. Environments Shared (relatively little effect compared to genes)
Non-shared
Within Family
Outside Family

9. Genes and Personality No single gene,
instead multiple genes in complex combinations and patterns,
turned on and off by experiences

10. Implications??? When we can genetically engineer personality,
should we ???