Morley wrote:Help me out, Stem. Where did you get this idea?
Mostly by reading source material as people brought this question (related to the Book of Mormon and its claimed middle eastern origin of some people) to the fore.
Normally you'll see the best and most pronounced conclusions along these lines: "Recent genetic research has greatly expanded our understanding of the probable origins and distinct geographic patterns of certain groups of people, including Jews. This recent research has superceded some of the earlier studies on Jewish DNA, allowing a reassessment of the theories of Jewish origins in light of this new research. "
From:
http://www.jogg.information/11/coffman.htmIts all "probable", "Possible", "likely", "appears" and such. There isn't a lot of definitive speak on this front. If you follow the link you can read about Jewish DNA studies and see much the same in these terms...while it appears Jews have been a focus of study in the realm of genetics for quite some time. It seems they haven't quite firmed up a whole lot on that front.
Future molecular studies of ancient populations will help us discover the places and times of human diversification and the migration routes of ancient populations.
from:
http://mbe.oxfordjournals.org/content/17/9/1396.fullAs it is, future studies will help to discover some of the questions that are being uncovered, in terms of migrating peoples and their origins. I don't know of too many studies that went the route of this last one in which actual samples from different purported eras were compared. It was quite fascinating. Much could be said on this for Jewish origins too, I'd think.
Here is Dr. John Butler's take on a study conducted in Iceland (I know he's Mormon so you're probably already biased against his take but here it is anyway):
An interesting study reported in the June 2003 issue of the American Journal of Human Genetics leads me to believe that it is possible for Book of Mormon peoples to be ancestors of modern Native Americans and yet not be easily detected using traditional Y-chromosome and mitochondrial DNA tests. This study, conducted by a group of scientists from a company called deCODE Genetics, used the extensive genealogies of people from Iceland combined with probably the most massive population study ever performed. They traced the matrilineal and patrilineal ancestry of all 131,060 Icelanders born after 1972 back to two cohorts of ancestors, one born between 1848 and 1892 and the other between 1798 and 1742.
Examining the same Y-chromosome and mitochondrial DNA markers used in other genetic studies, these 131,060 Icelanders revealed highly skewed distributions of descendants to ancestors, with the vast majority of potential ancestors contributing one or no descendants and a minority of ancestors contributing large numbers of descendants. In other words, the majority of people living today in Iceland had ancestors living only 150 years ago that could not be detected based on the Y-chromosome and mitochondrial DNA tests being performed yet the genealogical records exist showing that these people lived and were real ancestors. To the point at hand, if many documented ancestors of 150 years ago cannot be seen with Y-chromosome and mitochondrial DNA tests from modern Iceland, then the possibility can exist for people that are reported in the Book of Mormon to have migrated to the Americas over 2600 years ago and yet not have detectable genetic signatures today.
Here's a link:
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1180299/