高中《生物》中关于遗传系谱的判定是一个难点，学生遇到这类题目觉得很棘手。本人在教学中注意各类遗传特点的比较，找出它们的特殊规律，为学生总结出一种简便，易懂的解题方法。全过程分为四步，可简单归纳为“三看一找”。现介绍如下：1一看系谱中有无隔代遗传现象1．1若有 The determination of the genetic genealogy in high school “biology” is a difficult point, and students find it very difficult to encounter such problems. I pay attention to the comparison of various genetic characteristics in teaching, find out their special rules, and sum up a simple, easy-to-understand solution method for students. The whole process is divided into four steps and can be simply summed up as “three look and one look.” The introduction is as follows: 1 At a glance, whether or not there are genetic phenotypes in genealogies 1.1 If there are