教学难点是指与学生已有的知识、经验、能力之间具有较大落差,学生较难理解和掌握的新知识点。“孟德尔的豌豆杂交实验(二)”无疑是高中生物教学的难点和重点。本文以此为例,介绍如何根据教学内容,让学生在自主探究中进行逻辑推理,突破难点。一、复习旧知,引出问题通过设问,让学生叙述分离定律的内容,并回答一对相对性状的纯合亲本杂交,F1代和F2代的性状及F2代的性状分离比。如纯合的高茎豌豆(AA)和 Teaching difficulties refers to the students with existing knowledge, experience, ability to have a big gap between the students more difficult to understand and master the new knowledge points. “Mendel’s pea hybridization experiment (b) ” is undoubtedly the difficulty and focus of high school biology teaching. This article takes this as an example, introduces how to make students make logical reasoning in self-exploration according to the teaching content, and break through the difficulties. First, the review of the old knowledge, leads to questions by asking students to describe the separation of the law, and to answer a pair of relative trait homozygous parental cross, F1 and F2 generation traits and F2 generation trait segregation ratio. Such as homozygous tall pea (AA) and