Genes can be turned on and off :: DNA from the Beginning
http://ghr.nlm.nih.gov/handbook/howgeneswork/geneonof......First click on "How Genes Work" and then to the right click on "Can genes be turned on and off in cells?"
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http://www.nature.com/scitable/topic...-Regulation-15
This link states in the second paragraph:
"Genes can't control an organism on their own; rather, they must interact with and respond to the organisms environment.