Steve Carey wrote:
My organism has 2 bionts and it also has the fission ability - how many purchases can it make on its turn?
Each Biont can make 2 purchases, so four altogether. The relevant rule is found in Part H:
"Each player may make one purchase for an Organism for each Biont he has in that Organism, either per H1 through H4 (for Microorganisms), or <advanced> per H4 and H5 (for Macroorganisms)...each of your Bionts in an Organism starting with one or more fission Mutations may make two sequential purchases instead of one."