In the following diploid I-P+O+Z+Y-/I-P+O+Z-Y+ the Beta-galactosidase gene is
D. all of the above
E. none of the above
The lac I gene encodes for Lac repressor and inhibits the expression of Z, Y and A gene. In above condition lac I- means either lacI mutant will not form repressor OR repressor will not able to bind with operator. lac I- mutant are generally recessive in nature. If there is no repressor OR repressor is not bind with operator, expression of genes Z, Y and A will be constitutive. Hence in above Lac I- haploid, expression of Beta-Galactosidase gene (Z) will be consitutive. So C option "Constitutive" is the correct option.
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