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有丝分裂与减数分裂是真核细胞重要的增殖方式。细胞增殖不仅使生物达到了增加细胞数量的目的,还对生物的遗传和变异具有重要的意义。纵观近几年高考对这部分的考查,主要涉及细胞增殖的过程、细胞增殖过程中的一些数量变化、细胞增殖图像等。考点扫描一、细胞周期1.具有细胞周期的条件(1)只有连续分裂的细胞才有细胞周期。有些细胞分裂结束后不再进行分裂,它们就没有细胞周期,也有的细胞是暂时停止分裂。(2)生物体有细胞周期的细胞:受精卵、干细胞、
Mitosis and meiosis are important ways of proliferation of eukaryotic cells. Cell proliferation not only allows the organism to achieve the purpose of increasing the number of cells, but also has important significance for the genetics and mutation of the organism. Throughout this section of college entrance examination test in recent years, mainly related to the process of cell proliferation, cell proliferation in the number of changes in the number of cell proliferation images. Test site scanning a, the cell cycle 1 with the cell cycle conditions (1) only the continuous division of the cells have the cell cycle. Some cells no longer split after the division, they have no cell cycle, and some cells temporarily stop dividing. (2) Cells of the organism with cell cycle: fertilized egg, stem cell,