Final answer:
Findings that identical twins share more personality traits compared to fraternal twins suggest a significant genetic influence on personality, aligning with the Minnesota Study of Twins Reared Apart's conclusion on the heritability of these traits.
Step-by-step explanation:
If data has been gathered on the personalities of a large sample of identical and fraternal twins, and it is observed that identical twins share significantly more traits with their twins than the fraternal twins do, a reasonable conclusion can be drawn about the heredity of personality traits.
The finding that identical twins, who have identical genes, exhibit more similar personality traits than fraternal twins, who are genetically less alike, supports the notion that genetics play a substantial role in the development of personality. This aligns with the results of the well-documented Minnesota Study of Twins Reared Apart, which indicated that personality traits have a considerable heritable component.