If you start off with ME2, then the default one who lives is the opposite sex of your Shepard.
There is a downloadable interactive comic which allows you to make some of the choices before you start ME2.
ME2 defaults:
1. You never did a single ME1 side mission.
2. You never scanned planets.
3. You didn't save the colony on Feros.
4. Wrex is dead.
5. Arachni queen is dead.
6. The salarian commander on Virmire, Kirrahe, is dead.
7. That big asari ship, Destiny Ascension, is destroyed, so it's not a war asset in ME3.
So, aren't you glad you played ME1 first?