The following shows the genotype of a partial diploid bacterial cell where one chromosomal region Show more The following shows the genotype of a partial diploid bacterial cell where one chromosomal region containing the lac operon in Ecoli is given and the other fragment is from a plasmid carrying another lac operon from another source.
The two are separated by a slash (/). The possible answers indicate with a + or a – whether -galactosidase would be expected to be produced at induced levels under two circumstances: 1) first in the absence of lactose and 2) second in the presence of lactose. (Assume that glucose is not present in the medium.) Genotype G: I- Oc Z+/ F I- O+ Z+ KEY: I+ = wild-type repressor I- = mutant repressor (unable to bind to the operator) Is = mutant repressor (insensitive to lactose) O+ = wild-type operator Oc = constitutive operator (insensitive to repressor) Show less
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