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1、Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3
2、.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.复习有丝分裂前期：膜仁消失显两体； 中期：形定数晰赤道齐； 后期：点裂数加均两极； 末期：两消两显重开始。间期：DNA的复制和蛋白质的合成；结果：出现了姐妹染色单体时间长时间短Evaluation only.Evaluation only. Created with Aspose
3、.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides
4、 for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.一、 减数分裂减数分裂是进行有性生殖的生物 体在产生成熟生殖细胞时，进行的染 色体数目减半的细胞分裂。在减数分 裂过程中，染色体只复制一次，而细 胞分裂两次。减数分裂的结果是：成 熟生殖细胞中的染色体数目比原始生 殖细胞的减少一半。 学科网Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5
5、 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client
6、 Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.一、减数分裂一、减数分裂5 、结果：2 、发生的范围：3 、发生的时期：4 、特点：进行有性生殖的生物成熟生殖细胞中染色体数目只有原来的 一半染色体复制一次，细胞连续分裂二次1 、概念：P16原始生殖细胞 成熟生殖细胞 （如：精（卵）原细胞 精子（卵细胞）原始生殖细胞自身的产生是通过 有丝分裂 原始生殖细胞中染色体数目等于 本物种生物体细胞染色体数6 、场所： 有性生殖器官Evaluation only.Evaluati
7、on only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.
8、0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.1、同源染色体：（对）配对的两条染色体形状和大小一般都相同一条来自父方，一条来自母方体细胞中有无同源染色体？2、联会：同源染色体两两配对的现象a a b bccddA A B B3、四分体：联会后的每对同源染色 体 含有四条染色单 体，叫做四分体1个四分体=1对同源染色体=2条染色体=4条染色单体X、YEvaluation o
9、nly.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Pr
10、ofile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.复 制联会四分体减数第一次分裂（减）（初级精母细胞）次级精母细胞精细胞精子减数第二次分裂（减 ）变形阶段精原细胞 Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0
11、.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyr
12、ight 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.3. 特点:1个精原细胞（染色体数（染色体数:2n:2n）1个初级精母细胞（染色体数（染色体数:2n:2n）2个次级精母细胞（染色体数（染色体数:n:n）4个精子细胞（染色体数（染色体数:n:n）体细胞（染色体数（染色体数:2n:2n） 有丝分裂 细胞分化间期：细胞体积增大、染色体复制前期：联会、四分体（非姐妹染色单体 交叉互换） 中期：同源染色体排列在赤道板两侧 后期：同源染色体分离（非同源染色体 自由组合） 末期：形成2个次级精母细胞着丝点分裂，染色单体分离4
13、4个个2 2种种精子（染色体数（染色体数:n:n）变形减数第一次分裂减数第二次分裂Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.Evaluation only.Evaluation on
14、ly. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.整个过程细胞中没有同源染色体存在， 染色体不再复制染色体不再复制. .每条染色体的每条染色体的着丝点分裂，着丝点分裂， 姐妹染色单体分开。姐妹染色单体分开。 学.科.网减数第二次分裂的特点Evalu
15、ation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Cl
16、ient Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.交 叉 互 换四分体中的非姐妹染色单体间发生的交叉互换。Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.Evaluation only.E
