I just took a look at my test for Momoko. When I adopted her, I was told that she she was an F1 Morkie. However, when I had the test done, I didn't specify between the purebred/mixed breed/designer dog. I just wanted to see what results would come back. Anyway, here's a link to Momo's test...it will give you a vague idea of how Mars interprets the data:
http://goo.gl/6UHDx