Thanks for the link, Truthdancer.
Simon Southerton also touched on this in his recent Signature article. It's a better read and covers more trends in recent DNA aplogetics.
How DNA Divides LDS Apologists
When I debated David Stewart in 2006 I felt that the scientific part of the DNA debate was pretty much settled between apologists and Southerton, and only cranks like Stewart were still trying to argue for detectable "Middle Eastern" signatures in this hemisphere. The FAIR production shows that my impression was wrong. Apologists are trying to move forward from the defensive line they established against Southerton's book, where no remnant of Lehi's DNA would ever be expected to survive from the tiny original colony. Now they are becoming as painfully misleading as David Stewart.
John Tvetnes relies on the same pseudoscientific canards as David Stewart, in order to reach a comfortable rejection of DNA dating methods. The approach it like a creationist regards radiometric dating. For example:
Tvetnes wrote:I reject the idea that there is a specific rate to genetic mutation...
Another potential problem is the arbitrary assignment of 20 years per generation on average, which may or may not be accurate.
This is not an arbitrary assignment. In debating Stewart I cited recent studies that support recalculating some key migration times based on
increasing the average generation time beyond the standard 20 years. Although ancient mothers might have had their first child at a younger age than 20 years,
most children were born to a few women who had very large families, and
on average these children were born to mothers in their mid to late twenties. It's not the youngest births that matter, but the average births.
Being off by just a year or two in each generation can make a big difference when one is dealing with tens of thousands of years.
Well if the correct average generation time was 25 years instead of 20 years, then the migrations actually happened much earlier than currently estimated. Tvetnes shoots himself in the foot! Repeatedly, the apologists and lay members focus on geographical distributions as significant and helpful for Book of Mormon historicity, but the dates attached to these markers are a huge problem and there is simply no credible way to escape it except to reject DNA methods altogether.
Even guys with scientific training are straining to say there is DNA evidence to support the Book of Mormon. And the responses from LDS geneticists Ryan Parr and Keith Crandall...
how embarassing! They plainly do not have the polish of a seasoned spin doctor like John Tvetnes.
And I love how Simon puts some perspective on Keith Crandall's specious claim that recent DNA research puts "Middle Eastern" DNA in Mesoamerica just where you would expect it if the Book of Mormon is true:
Simon Southerton wrote:Crandall bases this claim on a paper published in 2005 by Noah Rosenberg and co-workers....
You can replace “Middle Eastern” in Crandall’s statement with the name of any of 38 other Eurasian populations in Rosenberg’s study and the statement would be JUST as valid. You could replace it with “Orkney Islanders, Russians, Cambodians or Japanese” and Rosenberg’s data would support it! If the evidence doesn’t rule out competing theories then it tells us precisely nothing. The genetic makeup of the Maya doesn’t stand out from many other American Indian populations.
I corresponded briefly with Crandall, pointing all this out but he was unmoved, dismissive and I suspect embarrassed by his carelessness in front of the camera.
LOL I can understand how "livy111us" (FAIR's YouTube promoter) would call this evidence, but Crandall should know better from the beginning, and at the very least he should see his error and try to correct his sloppy mistatement. I used to think Crandall was something special among the scientists at BYU because of his Dialogue paper:
http://www.dialoguejournal.com/excerpts/36-4.asp
,but he wrote that before he joined the faith. Now, it seems his judgment was polluted by the waters of baptism.