There are two variants of the enhancer sequence found in people. One has the sequence CACTAAAG, and this sequence is the binding site for a transcription factor. It is associated with dark hair. The other form has the sequence CGCTAAG at the same binding site for the same transcription factor. It is associated with blonde hair How can this small sequence difference be responsible for the observation that they lead to different rates of transcription and expression of the gene targeted by this enhancer.

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Dissection

Dissection is the process of cutting up the tissue of a dead or live animal or plant, to do anatomical studies and surgical treatments. The purpose of dissection is to learn more about the overall structure of organs and organ systems and thereby understand the physiology of the organism.