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Why did the ruler sample in the human taste genetics lab need to contain tracking dye?

Why did the ruler sample in the human taste genetics lab need to contain tracking dye?

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Tracking dye are used in taster lab so as to distuingh the ruler sample from other. Since it impart color to the sample, the loading process is visualized and the progression of sample through gel electrophoresis is monitored. It also help in size determination and interpretation in observation step

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