In the lac operon, the repressor:a. binds to allolactose and becomes active, blocking lac gene expression. b. binds allolactose and binds to the promoter, and induces lac gene expression. c. binds to allolactose and becomes inactive, allowing lac gene expression to occur. d. binds to the promoter and blocks lac gene expression.

c. binds to allolactose and becomes inactive, allowing lac gene expression to occur.

Explanation:

Interaction between allolactose and repressor leads to allosteric repulsion which makes repressor inactive leading to the lac gene expression. This is the reason why allolactose is known as the inducer of lac operon becasue it causes gene expression in lac operon.

In the absence of allolactose, the repressor binds the operator and does not allow RNA polymerase to do transcription.

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c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.