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DAN及染色体的数量变化是有丝分裂内容的重点和难点，引导学生绘制DNA及染色体的数量变化曲线有助于加强学生对这一重要知识的理解和运用。目前这两种曲线的画法不统一，给教学带来一定的困难。那么这两种曲线怎样才能准确地反映有丝分裂过程中DNA及染色体的数量变化呢？本文就
The changes in the number of DANs and chromosomes are the key and difficult points in mitotic content. Guiding students to draw DNA and chromosome quantity changes helps to strengthen students’ understanding and application of this important knowledge. At present, the drawing methods of these two curves are not uniform, which brings certain difficulties to teaching. How can these two curves accurately reflect the changes in DNA and chromosome numbers during mitosis? This article