“遗传的物质基础──染色体、DNA和基因”是人教版中师生物学第七部分第一章第二节的内容，笔者进行了教学改革，采用多媒体深件辅助教学，优化了课堂结构，提高了教学效率，荣获江苏省第二届中师生物学优质课评比第一名。现将教学过程及感受介绍如下：l＃学过程1．目创设情境 The “Material Material Basis: Chromosome, DNA, and Gene” is the content of the second section of the first chapter of the seventh chapter of the Bibliography of People’s Education. The author carried out the teaching reform and adopted multimedia deep-assisted teaching to optimize the classroom structure. The teaching efficiency was improved and it won the first prize in the second session of the Jiangsu Provincial Department of Biology and Quality. Now introduce the teaching process and experience as follows: l # learning process 1. Create a situation