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上课坐姿端正,不许搞小动作,保证上课紧 张状态,手不离笔,及时做好笔记。 课本、提纲要有勾划圈点做标注,写出疑惑, 在规定时间内完成提纲,合理按排时间,提 高课堂效率。 限时练必须限时,按时上交,组长按号排好。

课下作业画出精原细胞形成精细胞的过程,写出各时期特点
周四上午第二节课前交到集备室



1.判断所给图像的时期和分裂方式?减数分裂有没有细胞周期?

如何观察减数分裂呢?选择什么 样的实验材料?卵细胞是如何形 成的?

为什么卵细胞可以这么大个?他在形成过程中和精 子有何不同?阅读课本19-21页,完成课后作业



合作交流 思维碰撞
对议:
判断下列减数分裂的时期及子细胞名称



1.若形成100个精子和100个卵子至少需要精原细胞和卵原 组议:

细胞的数目分别是多少? 2.如何判断子细胞是来自来自同一个初级精母细胞和同一 个次级精母细胞?若发生交叉互换呢?如:提纲图3

1.判断下列减数分裂的时期及子细胞名称? 2.精子形成过程和卵细胞形成过程的区别?



1.若形成100个精子和100个卵子至少需要精原细胞和卵原细胞的 数目分别是多少? 2.如何判断子细胞是来自来自同一个初级精母细胞和同一个次级 精母细胞?若发生交叉互换呢?如:提纲图3

课本21页:观察蝗虫精母细胞减数分裂固定装片



前期Ⅱ

如何判断图1 细胞所属的器官? 回答提纲分析4问题?





卵细胞的形成过程

4 n 3

n 2 n 1
n

减数分裂
间期 减1 减2



染色体、染色单体和DNA数量变化规律坐标曲线及柱状图分析

有丝分裂 精(卵)原细胞

图中含有几对同 源染色体?

减 数 分 裂 过 程 图 解

判断下列曲线图、模式图、柱形图所代表的含义?




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