A Partial Diploid of Genotype I^- P⁺ O⁺ Z⁺

Question

A partial diploid of genotype I^- P⁺ O⁺ Z⁺ / I⁺ P⁺ O⁺ Z^- will show: A)inducible production of repressor. B)inducible production of $\beta$-galactosidase. C)constitutive production of $\beta$-galactosidase. D)no production of $\beta$-galactosidase. E)constitutive production of lactose.

Accepted Answer

The I⁺ allele produces a functional repressor protein, which can bind to the operator and regulate the expression of the Z gene. Since the Z⁺ allele is present, β-galactosidase can be produced, but only in the presence of an inducer, making it inducible.

A partial diploid of genotype I- P+ O+ Z+ / I+ P+ O+ Z- will show:

A partial diploid of genotype I^- P⁺ O⁺ Z⁺ / I⁺ P⁺ O⁺ Z^- will show: