I⁺P⁺O⁺Z⁺Y⁺

I⁺P^–O⁺Z⁺Y⁺

I⁺P⁺O⁺Z⁺Y^–

I⁺P⁺O^cZ⁺Y⁺

I^–P⁺O⁺Z⁺Y⁺

I^sP⁺O⁺Z⁺Y⁺

I⁺P⁺O^cZ⁺Y^–

I⁺P^–O^cZ⁺Y⁺

I^–P^–O⁺Z⁺Y⁺

is lac^– and the genes are not
transcribed

is lac⁺ and the genes are constitutively
transcribed

is lac^– and the genes are constitutively
transcribed

is lac ⁺ and the genes are inducibly
transcribed

is lac^– and the genes are inducibly
transcribed

is lac ⁺ and the genes are not
transcribed