When an Alpha Flux occurs (due to environment or if you roll a natural 1) you will now be given a choice.
[BULL] Draw from your Alpha Mutation deck.
[BULL] Draw from your DM's Alpha Mutation deck.
[BULL] Roll on the Alpha Mutations table.
In all cases, the Alpha Flux overrides your permanent mutation(s) until the end of the Encounter or you are affected by another Alpha Flux, whichever comes first. At the end of the Encounter, the Alpha Flux mutation subsides and your permanent mutation regains dominance.
You choose which Alpha Mutation is overridden.