Whether the shape of a personality is partly inherited — and the twenty years of famous findings that turned out not to replicate.
Why this topic Personality tests are a genre now, and every one of them invites the question of where the answer comes from.
Counted in Europe PMC, where the title or abstract names both this topic and that rsID. The number is papers, not evidence of a cause.
BDNF
Smoking behavior
11 papers →OPRM1
Opioid receptor sensitivity
2 papers →MTHFR
Folate metabolism (MTHFR C677T)
1 paper →APOE
Alzheimer's disease (late onset)
1 paper →ABO
ABO blood type
1 paper →Europe PMC, title and abstract only, searched for “personality traits”, “extraversion”, “conscientiousness”, “openness to experience” alongside each published rsID. Full text was not counted: it returns every paper with an rsID buried in a supplementary table. Recounted monthly.