Lissette is primarily concerned with the relative contributions of nature and nurture.
Explanation:
Nature vs nurture theory is a debate which aims to explain if an individual's <em>behaviors and personality</em> is developed by nature (<em>genetics, biological predispositions</em>) or nurture (influence of his/her environment).
In this case Lissette is wondering wether her African American and Asian American friends' personalities are a result from biological (nature) or cultural (nurture) influences.