细胞分裂的过程中染色体的行为变化与遗传变异的内在联系是高考的难点;细胞分裂图像的识别与判断,以及细胞周期中染色体和DNA的变化与计算是能力考查的重点。复习时以结构图或曲线图为基础,以细胞周期中染色体形态与数目、DNA的数量变化为线索,理解细胞分裂的特征和意义。染色 The intrinsic link between chromosome behavior changes and genetic variation during cell division is the difficulty of the college entrance examination; the identification and judgment of cell division images, and the changes and calculations of chromosomes and DNA in the cell cycle are the focus of the ability examination. When reviewing, based on the structure diagram or the graph, the chromosome shape and number in the cell cycle and the change in the number of DNA are used as clues to understand the characteristics and significance of cell division. dyeing