Q: Does the profile chart on page 121, include the benefits that Mutants and Possessed may gain from mutations? For example, can a Mutant who was bought with 2 of the Extra arm mutations, which would give him 3 attacks in close combat, only gain one more attack advance on his profile? Or could he end up with 4 attacks gained from advances and then have 2 extra attacks from having 2 extra arms?
A: No. Just as they don't include benefits of weapons models carry and yes, he could end up with six attacks if the dice favored him. [Games Workshop Official Mordheim's FAQ]
Q: Can you take a multiple of the same mutation so that each one gives you a benefit? For example: Tentacle twice for -1 Attack per tentacle.
A: Yes. However, in order to get three Tentacles, you must first buy the Extra Arm mutation as the Tentacle has to have an arm to grow from. You can have multiples of any of the mutations with cumulative effects. But, remember that a Possessed with say, two Blackbloods costs 180 GC! [Games Workshop Official Mordheim's FAQ]