lac operon
1. Table of Results Media Strain name/number A B C D 40 X X O X 30 O O O O 20 X O O O 10 X X X X 2. Strain #40 should be Y- because the lack of permease activity disables lactose flowing into the cell, and TMG induces it. Strain #30 produces the enzyme independently from the type of media, so it should be the I- type. Strain #20 is Wildtype because it doesnĄ¯t show enzyme synthesis in A, which is a glycerol medium where lactose nor TMG is available Strain # 10 is Z- type because it canĄ¯t synthesize anything even in the presence of lactose.