内容正文:
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〖想一想·议一议〗
有性繁殖的生物体,精子和卵细胞给子代带去了什么?
基因控制生物体的性状,性状的遗传实质上是亲代通过生殖过程把基因传递给子代。
在有性繁殖过程中,精子和卵细胞就是基因在亲子代之间传递的桥梁。
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Word教程: www.1ppt.com/word/ Excel教程:www.1ppt.com/excel/