Final answer:
The Minnesota Study of Twins Reared Apart found that identical twins, whether raised together or apart, have very similar personalities. Certain personality traits have a high heritability ratio, and traits are determined by a combination of genes and epigenetic factors.
Step-by-step explanation:
The Minnesota Study of Twins Reared Apart found several conclusions related to personality traits in identical twins. One of the conclusions drawn by the study is that identical twins, whether raised together or apart, have very similar personalities. This suggests that some aspects of our personalities are largely controlled by genetics. Another finding of the study is that certain personality traits, such as leadership and obedience to authority, have a high heritability ratio of more than 0.50. Lastly, the study observed that traits are not determined by a single gene, but by a combination of many genes and epigenetic factors.