In other words, you might not be who you think you are!
This is something that genealogy DNA experts all know but DNA newcomers usually do not. You can have your DNA sample taken one time and submit it to one testing service. A few weeks later, you will receive a report that shows the percentage of ancestry you have different parts of the world.
Simple, isn’t it? Well, not really…
For many people, perhaps most people, if they go back to that testing service’s web site some time later and look at their own DNA report again, they may find that the report has changed! The reason is simple: since the first report was completed, the DNA testing company has improved their database(s) with new and more extensive data. In fact, the DNA testing companies are often updating their ethnic origins databases in order to provide even more precise reports.
While your DNA obviously hasn’t changed, the information the testing company uses to interpret that DNA often changes when more information becomes available. As the Ancestry DNA web site says: