BIOL 414 Lecture 16: Day16

Give the levels of B-galactosidase activity (+ or -) expectedfor the following merodiploids for the lac operon.

Lactose Absent/ Lactose Present

1.) I+ P+ O+ Z- / I+ P- O+ Z+ _____ _____

2.) I+ P+ O+ Z- / I- P+ O+ Z+ ______ ______

3.) I+ P+ Oc z- / I+ P+ O+ Z+ ______ _____

4.) I- P+ Oc Z+ / I+ P+ O+ Z+ ______ _____

5.) I+ P+ Oc Z+ / Is P+ O+ Z+ ____ _____

Please explain!

I+ P- O^C Z+ Y+/ I- P+ O+ Z- Y-

For each of the following genotypes, indicate whether theproduction of normal b-galactosidase will beconstitutive, inducible, ornoninducible (absent). Briefly explain the reasonfor each answer.

(A) I⁺p⁺o⁺Z ⁺Y⁺A ⁺

(B) I^-p⁺o⁺Z⁺Y⁺A ⁺

(C)I⁺p⁺o^cZ^-Y⁺A⁺

(D) I⁺p⁺o⁺Z ^-Y⁺A⁺