A genotype that does not necessarily give the defined genotype, is best represen

Question

A genotype that does not necessarily give the defined genotype, is best represented as A. Penetrance. B. Expressivity. C. Heterosis D. Lyonization E. Segregation Under conditions of high lactose levels, which best describes the molecular mechanism for activation of the lac operon? A. Lactose binds directly to the lac I repressor gene and prevents transcription of the repressor. B. Lactose binds to RNA polymerase resulting in its release from the sigma factors. C. Lactose binds to an activator sequence within the operon, thereby stimulating transcription. D. Lactose binds to the lac I repressor and prevents it from binding to the operator. E. Lactose binds directly to the lac I repressor protein and prevents it from bind to the repressor gene.

Explanation / Answer

22. Option B. Expressivity

23. Option D. Lactose binds to the lac I repressor and prevents it from binding to the operator. (an isomer of lactose, allolactose, usually binds to the repressor protein)

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