染色体组和单倍体的概念，学生在学习时常易混淆，是“染色体变异”一节教学中的难点。这两个概念是学生学习二倍体和多倍体的基础，因而又是重点。如何进行这两个概念的教学，我进行了多次教学实验，教学中的体会如下：一、运用“教具演示——一教师引导——学生练习”法进行? The concept of chromosome groups and haplotypes, students often become confusing when they study, and it is a difficult point in the teaching of “chromosome variation”. These two concepts are the basis for students to learn diploids and polyploids, and thus they are also the focus. How to carry out these two concepts of teaching, I conducted a number of teaching experiments, teaching experience as follows: First, the use of “teaching demonstrations - a teacher to guide - students practice” method?