Finding your roots: Do DNA ancestry tests increase racial (in)tolerance?

While it is often assumed that Deoxyribonucleic acid (DNA) ancestry results illuminate one's true racial or ethnic lineage, the consequence of this inference remains largely unknown. This leaves two conflictual hypotheses largely untested: Do DNA ancestry tests increase racial tolerance or, alternatively, racial intolerance? Two multiwave experiments aimed to test these hypotheses using either real or bogus DNA ancestry results in combination with random assignment and a tightly controlled repeated-measurements experimental design. Bayesian and inferential analyses on both general and student populations of majority-group members in the United States (i.e., White/European Americans) indicated no support for either hypothesis on measures including multiculturalism, essentialism, and outgroup bias, even when moderating factors such as the degree of unexpected ancestry and genetic knowledge were considered. Despite wide societal optimism as well as concern, receiving DNA ancestry results appears not to impact feelings and attitudes about other racial and ethnic groups. Implications for prospective test-takers and education are discussed. (PsycInfo Database Record (c) 2024 APA, all rights reserved).