Improving the Experiment on the Extraction of DNA in the Lower Secondary School Science Class

Abstract

The purpose of this study was to improve the experiment on the extraction of DNA and to contribute to teaching materials used in this experiment in the enrichment study of the unit “cell and reproduction of living things” and in the elective science classes in lower secondary school. In traditional experiments, the material was warmed in hot water twice. In this study, by warming the material in hot water only once, DNA was extracted. Using the liver of an animal, DNA could be extracted by adding 2M NaCl before filtering. Using three methods to extract DNA, new materials for this study were found. In the elective science class in lower secondary school, students were able to perform this experiment very well.