DNA的租提取和物理性状观察实验，具体操作时关键步骤难以掌握，效果不太理想，成功率也不高。经过多次研究和试验，对该实验作了多处改进，掌握了成功的关键。现将具体操作介绍如下。1制备鸡血球液。实验前一天，取5％柠檬酸钠溶液100毫升，置于300毫升烧杯中，将宰杀活鸡流出 It is difficult to master the key steps of DNA extraction and physical property observation experiments, and the results are not ideal, and the success rate is not high. After many studies and experiments, many improvements have been made to the experiment and the key to success has been mastered. The specific operations are described below. 1 Preparation of chicken blood cell solution. One day before the experiment, 100 ml of a 5% sodium citrate solution was placed in a 300 ml beaker, and the live chicken was sacrificed.