Does it distinguish between Jewish groups, like German Jews from Russian Jews from Polish Jews?
...while genealogy tests such as those offered by Family Tree DNA are "valid," the companies "should give explanations of what the results mean. You have the same lineage as 10 million other people." In other words, the tests are not that meaningful by themselves. For example, all persons of Eastern European Jewish descent share many markers because they are descended from a rather small number of individuals, perhaps 50,000, who were alive in the year 1500.