初三《生物学》第七单元第二章第二节“基因的显性和隐性”中,关于显性基因和隐性基因,显性性状和隐性性状,学生理解起来很抽象很困难,有关这一方面的题目解决起来也一直是一个难点。而这些题目恰恰能较全面的训练和考察学生分析、判断、推理以及利用所学知识灵活解决问题的各种综合能力。下面我结合自己的教学谈一下这一类题目的解法。 In the third day of the third chapter of Biology, Chapter 2, Section 2, “Dominant and Recessive Genes”, students understand abstract and recessive genes, dominant and recessive traits Very difficult, to solve the problem in this area has also been a difficult task. These topics can be more comprehensive training and inspection of students to analyze, judge, reasoning and the use of knowledge to solve the problem with a variety of comprehensive ability. Here I talk about their own teaching about this type of problem solution.