There are some expected and some quite unexpected results in the Ancestry.com DNA Analysis for TRAEA's Grandma's genetic ethnicity. But since these can go back thousands of years, maybe anything's possible.
This grandma contributes a pretty concentrated genetic ethnicity to her descendants -
17% Southern European
16% British Isles
14% Central European
7% Eastern European
Scandinavian? Norway, Sweden, Denmark had never before been a blip on the genealogical radar. Ancestry explains that these were a well-travelled people (think Vikings), or as they wrote "seaborne raiders. . . . . violent pillagers. . . . . well-travelled merchants and ambitious explorers." In other words - if your roots are European, you may well find Scandinavians in your DNA soup.
Southern European - Italy, Spain and Portugal - I feel warmer already, although I never suspected any related connections to such a delightful region. Interesting possibilities there.
British Isles - totally expected. The only surprise is that this percentage isn't greater. A HUGE number of ancestors on the Hills / Hackett tree arrived in North America from the British Isles. But since DNA reaches back into the mists of history, the overall picture obviously blurs.
Central European - France, Germany, Austria - again expected, especially France. A smaller percentage than British Isles is also reasonable, although I'm amazed that those numbers are so close.
Eastern European - Poland, Belarus, Ukraine, Romania, Greece - hmmmmm. There is a family rumor of Jewish ancestry that dangles tantalizingly from one side of the tree, and there is the possibility of a Russian connection on the other side. Maybe there's some validity to one or both. Goodie!
Uncertain. Perfect - even DNA should leave a little wiggle room.