As the Daleks of the New Dalek Empire were all created by Davros, his genetic code ran through the entire race. (TV: Journey's End)
One account of the genocide of the Time Lords held that a Time Lord called the Keeper had managed to flee in a TARDIS with the genetic code of the First Time Lords. (GAME: Gallifrey in Chains [+]Loading...["Gallifrey in Chains (game)"])