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一、知识盘点1.细胞周期(1)细胞周期的概念和特点:①条件:连续分裂的细胞;②起点:一次分裂完成时;③终点:下一次分裂完成时;④特点:不同种细胞的细胞周期不同,分裂间期与分裂期所占的比例也不同。说明:只有连续分裂的细胞才有细胞周期,如植物形成层细胞、根尖分生区细胞、动物皮肤生发层细胞等。高度分化的
First, the knowledge inventory 1. Cell cycle (1) the concept and characteristics of the cell cycle: ① conditions: continuous division of cells; ② starting point: a division is completed; ③ end point: the next division is completed; ④ characteristics: different kinds of cells The cell cycle is different, the proportion of interphase and mitotic division is also different. Note: Only cells that divide continuously have cell cycle, such as plant formation cells, apical meristematic cells, animal skin germinal cells and so on. Highly differentiated