Problem

Solutions For An Introduction to Genetic Analysis Chapter 11 Problem 23P

Step-by-Step Solution

Solution 1

The below table shows the relative levels of β galactosidase activity in cells grown under similar conditions:

	Glucose	Lactose	Lactose + Glucose
Wild type	0	100	1
lacI ^-	1	100	1
lacI ^s	0	0	0
lacO ^-	1	100	1
crp ^-	0	1	1

Step #2 of 5

When the cell is lacI^-, it leads to absence of negative control by repressor binding, but still under the positive control of CAP-cAMP (Catabolite activator protein-cAMP) binding.

Step #3 of 5

When the cell is lacI^s, the transcription will be blocked under all conditions since the repressor does not bind lactose, but still binds deoxyribonucleic acid (DNA).

Step #4 of 5

When the cell is lacO^-, it leads to absence of negative control by repressor binding, but still under the positive control of CAP-cAMP binding.

Step #5 of 5

When the cell is crp^-, it leads to absence of positive control by CAP-cAMP binding, but still under the negative control of repressor binding.

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Solutions For Problems in Chapter 11