Independent variable: Presence or absence of DNA extraction solution; Dependent variable: Visibility or quantity of extracted DNA from strawberries.
In a do-it-yourself DNA extraction experiment with strawberries, the independent variable is the presence or absence of the DNA extraction solution. This variable is manipulated by the experimenter to observe its impact on the dependent variable, which is the visibility or quantity of the extracted DNA from the strawberries.
The extraction solution serves as the critical factor influencing the success of DNA extraction, with the visibility or quantity of DNA serving as the measurable outcome. By varying the presence of the DNA extraction solution, one can assess its influence on the effectiveness of extracting DNA from strawberries, providing insights into the experimental process and the factors affecting successful DNA extraction.