The hypothesis for extracting DNA from strawberries could be framed as follows:
Hypothesis: "If strawberry cells are broken down and lysed, then the DNA can be successfully extracted and visualized due to the presence of large amounts of DNA in the cells, which can be separated from cellular debris."
This hypothesis is based on the idea that strawberries, being octoploid organisms, contain multiple copies of each chromosome, resulting in a higher yield of DNA compared to many other fruits. The experiment typically involves breaking down the cell walls (using techniques such as mashing), breaking down the cell membranes (using a detergent), and then separating the DNA from proteins and other cellular components through precipitation with alcohol (e.g., ethanol or isopropanol).
You could structure further investigations to test different conditions or methods of extraction to see how these factors affect the yield and visibility of the DNA.