做“DNA的粗提取与鉴定实验”(内容见人教版高中生物第二册P6必修),教材推荐用实验材料是鸡血,由于鸡血成本高昂,该实验几乎成了生物实验的摆设,失去了其学生实验的价值。实际上,本实验可用香蕉代替鸡血,而且操作步骤很简单。下面针对香蕉作这一实验的材料进行简要介绍。一、材 To do “crude DNA extraction and identification experiment” (see PEP secondary school biology P6 compulsory), textbook recommended experimental material is chicken blood, due to the high cost of chicken blood, the experiment has almost become a biological experiment display, Lost the value of their students experiment. In fact, this experiment can use bananas instead of chicken blood, and the operation steps are simple. The following is a brief introduction of banana materials for this experiment. First, material