The DNA does not dissolve in ethanol. When ethanol is added to the mixture, all components of the mixture, except DNA, stay in the solution while the DNA settles out into the ethanol layer. The solution is allowed to stand for 2-3 minutes then white DNA will settle into the ethanol layer.

Onion DNA Extraction Experiment

Preface In this experiment, onions are used, this is because the onion has a low starch content, which allows the DNA to be clearly visible. Salt protects the negative end of the DNA phosphate, allowing the tip to come closer so that DNA can precipitate from a cold alcohol solution. Detergents cause cell membranes to…

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