In Mass Effect 2, you recruit a number of different characters for a suicide mission to take down the Collectors who have been abducting humans for unknown reasons. To ensure your crew is ready, you need to earn their loyalty by completing personal missions for each companion, one of which will be for your token scientist salarian, Mordin.
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His mission is called 'Old Blood', which involves rescuing an old colleague of his from some krogan on Tuchanka. However, things are more complicated than they seem, which will be discussed later on in this walkthrough of Mordin’s loyalty mission.
After you complete the 'Horizon' mission, you’ll see this mission pop up in your journal saying “Mordin wants to talk with you”. He can be found in his usual spot in the research lab on deck two of the Normandy.
When you talk to him, Mordin will explain that he was a member of a Salarian STG squad tasked with modifying a new strain of the Genophage after the krogans started adapting to the old one. Regardless of your opinion on the matter, he’ll then tell you that his former protégé, Maelon has been kidnapped by the Blood Pack and was last seen on Tuchanka. Naturally, you're going to want to help your buddy out, right?
After you finish the conversation, head to Tuchanka and talk to the leader of Clan Urdnot (either Wrex or Wreav, depending on if the former survived Virmire in the first game). He’ll point you to the Chief Scout located straight ahead, just past the barren pit. Alternatively, you can just go straight to the Chief Scout if you have already introduced yourself to the clan leader.
Ask the Chief Scout about Maelon and he’ll say that it's likely that rival Clan Weyrloc has
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