内容正文:
即将上课,请做好学习准备!
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1
〖想一想·议一议〗
现代各个品种的金鱼是由其野生类型的金鲫鱼人工培育而来的。下图中,金鱼与金鲫鱼的外形差异很大,你能说出金鱼身体颜色变化的原因吗?
人们根据自己的喜好和需求,经过长时间培育,品种不断优化,进行人工选择的结果。
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PPT背景图片:www.1ppt.com/beijing/ PPT图表下载:www.1ppt.com/tubiao/
优秀PPT下载:www.1ppt.com/xiazai/ PPT教程: www.1ppt.com/powerpoint/
Word教程: www.1ppt.com/word/ Excel教程:www.1ppt.com/excel/
资料下载:www.1ppt.com/ziliao/ PPT课件下载:www.1ppt.com/kejian/
范文下载:www.1ppt.com/fanwen/ 试卷下载:www.1ppt.com/shiti/
教案下载:www.1ppt.com/jiaoan/
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2
不同品种的菊花
生物圈中的生物种类繁多,不同种类的生物之间千差万别,同种生物只见也存在各种各样的差异,这都源于生物的变异。
不同品种的玉米果穗
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PPT背景图片:www.1ppt.com/beijing/ PPT图表下载:www.1ppt.com/tubiao/
优秀PPT下载:www.1ppt.com/xiazai/ PPT教程: www.1ppt.com/powerpoint/
Word教程: www.1ppt.com/word/ Excel教程:www.1ppt.com/excel/
资料下载:www.1ppt.com/ziliao/ PPT课件下载:www.1ppt.com/kejian/
范文下载:www.1ppt.com/fanwen/ 试卷下载:www.1ppt.com/shiti/
教案下载:www.1ppt.com/jiaoan/
字体下载:www.1ppt.com/ziti/
3
第五节 生物的变异
4
1
探究一种变异现象
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