Final answer:
The allele version of AVP1aR associated with altruism in dictator game paradigms is the 334 variant.
Step-by-step explanation:
Altruism in dictator game paradigms has been associated with the arginine vasopressin receptor 1a gene (AVP1aR). Specifically, the allele version of AVP1aR known as the 334 variant has been linked to more altruistic behavior in studies.
For example, a study conducted by Zak et al. (2005) found that individuals with the 334 variant of AVP1aR were more likely to give money to strangers in a dictator game, compared to those with other variants of the gene.
It is important to note that while the 334 variant has been associated with altruistic behavior, it is not the sole determinant of altruism. Altruistic behavior is influenced by a combination of genetic, environmental, and social factors.