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基因的显性和隐性(教案)

  • 2026-04-17 00:47:14
基因的显性和隐性(教案)

第三节 基因的显性和隐性

1.生命观念:理解基因的显性和隐性的概念,以及它们在生物遗传中的作用,形成遗传物质控制生物性状的生命观念。

2.科学思维:

1)通过分析孟德尔的豌豆杂交实验,培养逻辑思维能力和科学探究精神。

(2)能够运用基因的显性和隐性知识解释一些遗传现象,提高分析问题和解决问题的能力。

3.探究实践:

1)体验孟德尔的科学研究方法,学习他严谨的科学态度和勇于探索的精神。

(2)尝试设计简单的遗传实验,培养科学探究能力。

4.态度责任:

1)了解近亲结婚的危害,认同禁止近亲结婚的法律规定,增强社会责任感。

(2)能够向他人宣传禁止近亲结婚的重要性,倡导健康的生活方式。

1.教学重点:

1)孟德尔的豌豆杂交实验过程和实验结论。

(2)基因的显性和隐性的概念。

2.教学难点:

1)理解孟德尔的豌豆杂交实验原理和过程。

(2)运用基因的显性和隐性知识解释生物的遗传现象。

教学环节

教师活动

学生活动

情境导入

  课件展示双眼皮父母生出单眼皮孩子、有酒窝父母生出无酒窝孩子等关于遗传现象的图片,引发学生的好奇心。

  提问引导:“为什么会出现这些看似不符合常理的遗传现象呢?难道遗传不是简单的父母性状的传递吗?”

观察图片,思考问题,发表自己的看法。

新知探究

探究一 孟德尔的豌豆杂交实验

  1.介绍孟德尔的生平事迹,强调他在遗传学领域的重要贡献,激发学生对科学研究的兴趣。

  2.利用多媒体课件展示孟德尔的豌豆杂交实验过程,包括实验材料(豌豆)的特点(自花传粉、闭花受粉、有易于区分的相对性状等)、实验方法(人工异花传粉)以及实验步骤(纯种高茎豌豆和纯种矮茎豌豆杂交、子一代自交)。

  3.在展示实验过程的同时,引导学生观察实验现象。

认真观察、倾听。

观察多媒体课件展示的实验过程,思考问题,并记录实验现象。

教学环节

教师活动

学生活动

新知探究

  提问:纯种高茎豌豆和纯种矮茎豌豆杂交后,子一代的性状表现如何?子一代自交后,子二代的性状表现又如何?

  4.总结实验现象:纯种高茎豌豆和纯种矮茎豌豆杂交后,子一代全部表现为高茎;子一代自交后,子二代中既有高茎豌豆,又有矮茎豌豆,且高茎与矮茎的比例接近3∶1。

探究二 基因的显性和隐性

  1.结合孟德尔的豌豆杂交实验结果,引出基因的显性和隐性的概念。解释在相对性状中,控制显性性状的基因称为显性基因,控制隐性性状的基因称为隐性基因。通常用大写字母表示显性基因,小写字母表示隐性基因。

  2.以豌豆的高茎和矮茎为例,讲解基因的组合方式和性状表现之间的关系。纯种高茎豌豆的基因组成是DD,纯种矮茎豌豆的基因组成是dd,它们杂交后子一代的基因组成是Dd,由于D是显性基因,d是隐性基因,所以子一代表现为高茎。

  3.进一步讲解子一代自交后,子二代的基因组成和性状表现。子一代(Dd)产生的生殖细胞有两种,分别是D和d,它们随机结合形成子二代的基因组成有DD、Dd、dd三种,其中DD和Dd表现为高茎,dd表现为矮茎,比例接近3∶1。

  4.通过表格的形式总结基因的组合方式和性状表现之间的关系,帮助学生理解和记忆。

探究三 禁止近亲结婚

  1.展示一些近亲结婚导致遗传病发生的案例资料,如白化病、红绿色盲等,让学生了解近亲结婚的危害。

  2.讲解近亲结婚的概念,即直系血亲和三代以内的旁系血亲之间的婚配。

  3.从基因的角度解释近亲结婚的危害,由于近亲之间携带相同隐性致病基因的可能性较大,近亲结婚时,两个隐性致病基因相遇的机会增加,从而使后代患遗传病的概率大大提高。

  4.介绍我国民法典规定禁止近亲结婚的法律依据和重要意义,强调这是保障家庭幸福和民族健康的重要措施。

结合老师的讲解,分析豌豆高茎和矮茎的基因组成和性状表现之间的关系,填写相关表格。

观看案例资料,了解近亲结婚导致遗传病发生的严重后果。

课堂小结

通过本节课学习,同学们知道了:

1.孟德尔的豌豆杂交实验:纯种高茎豌豆和纯种矮茎豌豆杂交,子一代全部表现为高茎;子一代自交,子二代中高茎与矮茎的比例接近3∶1。

2.基因的显性和隐性:控制显性性状的基因是显性基因,控制隐性性状的基因是隐性基因;基因的组合方式决定了生物的性状表现。

3.禁止近亲结婚:近亲再婚配生育,产生隐性纯合子的概率将增大,隐性遗传病出现的概率就会增大。

和老师一起复习,查漏补缺。

第三节 基因的显性和隐性

一、孟德尔的豌豆杂交实验

1.实验过程

纯种高茎豌豆×纯种矮茎豌豆→子一代(高茎)→子二代(高茎∶矮茎≈3∶1)

2.实验结论

基因有显性和隐性之分

二、基因的显性和隐性

1.显性基因(大写字母)→显性性状

隐性基因(小写字母)→隐性性状

2.基因组合与性状表现

DD、Dd→显性性状

dd→隐性性状

三、禁止近亲结婚

1.近亲结婚的危害:增加后代患遗传病的概率

2.民法典规定:直系血亲或者三代以内的旁系血亲禁止结婚

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  1. CONNECT:[ UseTime:0.000582s ] mysql:host=127.0.0.1;port=3306;dbname=a_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000896s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000347s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000283s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000598s ]
  6. SELECT * FROM `set` [ RunTime:0.000238s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000750s ]
  8. SELECT * FROM `article` WHERE `id` = 482053 LIMIT 1 [ RunTime:0.000902s ]
  9. UPDATE `article` SET `lasttime` = 1777240933 WHERE `id` = 482053 [ RunTime:0.000539s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000268s ]
  11. SELECT * FROM `article` WHERE `id` < 482053 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000455s ]
  12. SELECT * FROM `article` WHERE `id` > 482053 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000834s ]
  13. SELECT * FROM `article` WHERE `id` < 482053 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001169s ]
  14. SELECT * FROM `article` WHERE `id` < 482053 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.016204s ]
  15. SELECT * FROM `article` WHERE `id` < 482053 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004360s ]
0.098190s