“DNA的结构和复制”这一知识点在中职遗传学和变异的教学中占有非常重要的地位,因为DNA的结构是DNA复制的基础,DNA的复制与有丝分裂和减数分裂的内容有密切的联系,还是后续内容基因的表达和基因突变等的基础,而且这一知识点的内容比较抽象,再加上中职学生普遍的基础和学习的主动性都比较差,这就给这个教学难点的突破提出了很大的挑战。笔者根据这些主 The point of DNA Structure and Replication plays a very important role in secondary genetics and mutation teaching because the structure of DNA is the basis of DNA replication, DNA replication and mitosis, and meiosis Is closely linked to the content of subsequent gene expression and gene mutations based on the basis of more abstract knowledge of this point, coupled with the general foundation of secondary vocational students and learning initiative are relatively poor, which gives this Breakthrough in teaching difficulties presents a great challenge. The author based on these masters