Biological Bases of Social Behavior (8C) Practice Test

A field study tracked cooperative behavior in a coastal community where fishing requires coordinated boat launches. Researchers observed that individuals who frequently helped non-kin with equipment repairs were more likely to receive help during future storms, even from those they had not directly helped. Interviews suggested people monitored reputations and avoided those labeled as “free riders.” From an evolutionary perspective, which biological process is most consistent with the observed behavior?

A lab examines genetic contributions to social anxiety using a twin sample. Identical twins show higher concordance for elevated social avoidance scores than fraternal twins, even when raised in different households. In a virtual group discussion task, high-avoidance participants speak less and show stronger self-focused attention (e.g., monitoring their own speech errors) despite similar baseline mood ratings. Which interpretation best fits the biological basis of the observed social behavior?