The following table shows several bacterial strain lac operon genotypes (some are partial diploids).
a) Fill in the blanks in the lactose absent and lactose present columns in this table. (+) means significant levels of active ß-galactosidase enzyme can be detected. () means no significant levels of active ß-galactosidase enzyme. The first line is filled in for reference.
1. lacI+ lacP+ lacO+ lacZ+ lacY+
2. lacI+ lacP+ lacOc lacZ+ lacY+
3. lacI+ lacP+ lacOc lacZ lacY+
4. lacIs lacP+ lacOc lacZ+ lacY+
5. lacI lacP+ lacO+ lacZ+ lacY+ / lacI+
6. lacIs lacP+ lacO+ lacZ+ lacY+/ lac I+
b) If lactose is absent and glucose is present in the culture medium of strain 4, will significant levels of active ß-galactosidase enzyme be detected? Explain in brief, just because there is lots of room left, you dont need to fill it.
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