The Cylons offer superior FTL drives in exchange for citizenship in the colonies.  This doesn't sit well with many, including Zarek.  Doc Cottle performs an ultrasound for the first Cylon/Cylon offspring between Tigh and Number Six.  Also, Tyrol finds out that he cannot save his son from renal failure since his blood doesn't match.  The quorum gives all ship's captains the right to refuse boarding to any Cylon which causes the fuel ship to jump away.  Adama convinces Zarek to tell him the location.  Later Gaeta partners with Zarek, discontent with the way things are going with the proposed alliance.