What is gene expression?
A. The manner in which phenotypes differ from genotypes
B. The control of when and where proteins are made
C. The number of proteins an organism can produce
D. The total number of genes a person has

B. The control of when and where proteins are made

Explanation:

It acts as both and on/off switch to control when proteins are made and also a volume control that increases or decreases the amount of proteins made.

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