Please answer this question regarding DNA, isopropyl and ethyl alcohol.?

We did a lab where we extracted DNA from a germ wheat cell. Here is what we did: first we heated a beaker of water to around 60 degrees Celsiuswe added 15 ml of the water into a beaker. we also added meat tenderizer and about 1 gram of germ wheat (which is the germ wheat cell before it is processed into flour). Then we mixed the solution for around 3 minutes. After, we added 1mL of alcohol to the beaker slowly so no foam produced. After, we mixed the beaker slowly so no foam produced for approxmapproximatelytes. Next we took cold alcohol (ethyl alcohol) and added it slowly to the solution so it created a layer on the top. Once the alcohol was added, the DNA floated to the top in a white stringy substance. That was our control experiment. For our experimental group, we changed ethyl alcohol with isopropyl and re did the experiment. The only noticable change was that the DNA didnt flow to the top as high as if we used ethyl alcohol but the amount of DNA that was extracted was about the same. My teacher explained to me that she thought that Ethyl Alcohol was more dense than Isopropyl and thus, the DNA was higher in the Ethyl Alcohol than the Isopropyl. Yet the density of ethyl alcohol is 0.791 g/cm3 and the density of isopropyl is 0.785g/cm3. This theory would make no sense becaue the difference in density is too small for something notable would happen like that. Speculate reasons why.
I mean speculate reasons why that the isopropyl acts this way and the ethyl alcohol acts this way in the experiment. Thank you and please answer.

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