What does genetic evidence show about Native American ancestry, and how does it bear on the Book of Mormon?
Common ground
Published genetic studies trace the great majority of pre-Columbian Native American ancestry to populations that came through Asia long before 600 BC. The Church’s 2014 Gospel Topics essay “Book of Mormon and DNA Studies” accepts this broad account. The introduction added to the Church’s 1981 edition of the Book of Mormon called the Lamanites “the principal ancestors of the American Indians”; the current introduction says “among the ancestors.” The dispute concerns what ancestry the Book of Mormon predicts: whether its narrative and longstanding Church interpretations imply a substantial Israelite contribution that should be detectable, or whether a small migrant group entering a populated continent could have left no recognizable genetic signature, and whether the text itself allows for substantial other populations. The absence of an identified Book of Mormon lineage and evidence against predominantly Israelite ancestry are related but different questions.
A sustained critical response to limited-geography and genetic-loss explanations, with regional evidence and replies.
Population-genetics limits
A small Near Eastern colony within an existing population could lose its identifiable genetic signature through drift, intermarriage, and population bottlenecks.
McClellan argues that the demographic history described in the Book of Mormon would disrupt the conditions needed to preserve and identify a small founding group’s genetic signature. He concludes that recovery of Lehi’s or Mulek’s DNA is improbable and that, without an identifiable founding signature, the narrative does not supply a testable population-genetic hypothesis.
Meldrum and Stephens jointly propose that Lehi’s descendants were a small population interacting with a much larger indigenous population. They argue that intermarriage and the loss of inherited markers make detection of those descendants unlikely, while cultural and covenant relationships can persist without an identifiable genetic lineage.
Butler argues that reconstructing ancient population ancestry differs from identifying an individual in a forensic DNA test: it requires reliable reference populations and assumptions about inheritance. Because Book of Mormon founding DNA is unknown and many ancestral lineages can disappear from mitochondrial and Y-chromosome records, he concludes that current DNA comparisons cannot decide the book’s authenticity.
Whiting argues that a small Book of Mormon colony entering an already populated continent would have a complex genetic history that present-day DNA could not straightforwardly reconstruct. Unknown founding lineages, intermarriage, genetic drift, and limited geography make both genetic confirmation and genetic rejection of that history difficult.
Perego and Ekins jointly argue that DNA is useful for reconstructing Native American population history but cannot conclusively establish or exclude Book of Mormon migrants. Unknown founding DNA, genetic drift, population bottlenecks, intermarriage, and difficulties distinguishing recent migrations could leave a small Near Eastern group without a recognizable genetic trace.
Southerton argues that the Asian ancestry identified in Native American genetic studies conflicts with the Israelite ancestry taught in longstanding readings of the Book of Mormon. In his joint Anthropology News article with Murphy, he treats the proposed ancient Middle Eastern origin of the principal ancestors of American Indians as inconsistent with mitochondrial DNA evidence.
Murphy argues that genetic studies identify Asian ancestry throughout the Americas, including Central America, without the Israelite connection expected from traditional Book of Mormon readings. He contends that proposed small colonies and loss of genetic markers do not make a Mesoamerican setting a persuasive explanation, and favors a nineteenth-century origin as the more plausible account.
the best explanation—i.e., the most plausible one—remains a nineteenth-century origin of the Book of Mormon.
Model-dependent testing
Explicit settlement models make different genetic predictions: predominantly Middle Eastern ancestry fares differently from a small contribution to an existing population.
Leavitt, Marshall, and Crandall jointly argue that genetic evidence should be evaluated against explicit settlement models rather than a single undifferentiated Book of Mormon scenario. They find predominantly Middle Eastern ancestry models highly improbable, while a small contribution within a much larger Asian-derived population need not leave detectable Middle Eastern DNA; a larger local contribution faces greater difficulties.