I’m not sure how such a post has never made it on to the website, given the name of the website, but better late than never, I suppose. There are quite extensive posts on this elsewhere, although I think the best resource for detailed information on Mormons and DNA is from Jeff Lindsay’s site. But I’ll give my summary and own thoughts here.
The question goes like this–The Book of Mormon and Mormons in general claim that all Native Americans are descendants of the people of the Book of Mormon. If this is true, then we should find matching DNA between modern-day Jews and modern-day Native Americans. But we don’t, so therefore the Book of Mormon is false.
The statement sounds reasonable enough until you start thinking about it some more and learn more about what Mormons actually believe.
1. Neither the Book of Mormon nor Mormons in general claim that ALL Native Americans are descendants of the Book of Mormon people. Some are, some aren’t. What percentage are? Who knows. Maybe 90%, maybe 50%, maybe 1%. We don’t know. Unfortunately, prominent Mormons have assumed that a majority of Native Americans were descendants of the Book of Mormon people, and it’s easy to see how they came to this misconception such that they never questioned it, but the Book of Mormon itself says no such thing, neither is there any revelatory statement of such.
2. How do you go about getting the right DNA samples? As far as I know we don’t know what the DNA profile of a Hebrew or Jew from 600 BC, when the Book of Mormon people separated from those at Jerusalem, looks like. We don’t even know how “Jewish” the Book of Mormon people really were, in DNA terms. They could have already been quite mixed up with other strains of people. Then you combine what I said in point #1 and ask “If the Book of Mormon people were a relatively small group compared to others, how mixed up is that DNA with all these other people?”
That pretty much does it. In other words, any claims that DNA evidence refutes the authenticity of the Book of Mormon is based on flawed assumptions about what the Book of Mormon says, or on flawed science. For some more detailed explanations, check out these articles: