Aresearcher observes the social interactions between people who go to a large sports bar. at the end of the evening she takes a blood sample from everyone and sequences their dna. she finds that people who have a form of the dopamine receptor that predisposes them to risk-taking behavior are more likely to approach and begin talking to potential sexual partners than people who had a form of the dopamine receptor that was not associated with risk-taking behavior. can the researcher conclude that having this "risk-taking gene" makes it more likely that people will approach and interact with potential sexual partners?