The Table Below Lists Several Genotypes Associated with the Lac $\quad$

question 57

Essay

The table below lists several genotypes associated with the lac operon in E.coli.For each,indicate with a "+" or a "-" whether ?-galactosidase would be expected to be produced at induced levels.
$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\text { B-Galactosidase Production }$
$\begin{array}{lccc}\text { Genotype }& \text { No Lactose } &\text { With Lactose } \\\hline \text { (a) } I+O+Z+/ F^{\prime} I-O+Z+\\\text { (b) } I-O c Z-F^{\prime} I-O c Z-\\\text { (c) } I-O c Z+/ F^{\prime} I-O+Z+\\\text { (d) Is Oc Z-/F' Is } O+Z+\\\end{array}$

$I^{+}=$ wild-type repressor
$I$ - = mutant repressor (unable to bind to the operator)
$\mathrm{I}^{s}=$ mutant repressor (insensitive to lactose)
$\mathrm{O}^{+}=$ wild-type operator
$\mathrm{O}^{c}=$ constitutive operator (insensitive to repressor)

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Definitions:

Statistically Significant

A measure that indicates the likelihood that a result from data collected and analyzed in a study is not due to chance.

Probability Level

A statistical measure that indicates the likelihood of a particular outcome or event occurring.

Quality

The degree to which a product, service, or process is free from defects, deficiencies, and significant variations, measured against agreed standards or specifications.

Degree of Freedom

In statistics, it refers to the number of values in the final calculation of a statistic that are free to vary.