Destroy All Humans! 2

There are six gene blends to Bay City. You will have access to Abducting and Gene Blending as soon as you upgrade your saucer enough with the third mission's completion (where you end up having to destroy the blimps). Abducting six or so of each classification (both in terms of job and in gender) will guarantee that you have all you need for the Gene Blending this route.

The groups are:
(Male) Hippy
(Female) Hippy
*Unlocked from completing (Male) Hippy:
(Male) Urban
*Unlocked from completing (Female) Hippy:
(Female) Urban
*Completing the previous four will unlock:
Cop
Soldier

These are all of the blends for Bay City. Completing all of these will also unlock the Kremlin Hoodwink! Gene Blend. The KGB listed is actually located over on The Rock, outside of the prison compound.