Confusion about What DNA Tests Really Show?

Q: I’ve heard a great deal about the DNA tests that are popular right now, but a little confused.
What exactly does a DNA test (of a woman) show? Do the following races show up on a test: Native American, Jewish. I know, of course, what legal degree of Native American I am. (From my mother) I suspect that I have about 1/4th Jewish ancestry. Do this two races show up as different from the White race?

A: A DNA test will not tell you where your great great grandparents came from. Have you gotten that far back in your tree? Look here for some information about a DNA test. What you find will depend on what kind of test you get.