The hypothesis is wrong because the DNA that appears in the solution is a DNA cluster. The structure of DNA not shown in this experiment.
In our experiment the DNA of onion contain in the nucleus not in cytoplasm because an onion cell is eukaryotic cell that DNA is inside the nucleus. The precipitation of DNA of our experiment come from the salt that we added in the solution, and creation of a solid in a solution. The DNA can be dissolve in water but not in alcohol this is the reason why DNA represented on ethanol layer. A plant cell extract DNA harder than animal cell, animal cell would be easier because plant cell have cell wall it harder to break down but animal cell don’t have cell wall .
A strawberry cell produce DNA more than a banana cell because a strawberry has sets of chromosomes more than banana, we can compare the amount of DNA by making 2 solution strawberry and banana with the same volume and concentration.
In this experiment might has some errors such as we stirring too hard and get some bubbles, onion chopped too finely, added too much salt, put solution into hot bath too long, or added ethanol too hard.
Finally, the experiment pass through well and smoothly.