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某育种专家在农田中�现一株大穗不抗病的小麦自花授粉后获得160粒种子这些种子�育成的小麦中有30株大穗抗病和若干株小穗抗病其余的都不抗病 Template






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tomski某育种专家在农田中�现一株大穗不抗病的小麦自花授粉后获得160粒种子这些种子�育成的小麦中有30株大穗抗病和若干株小穗抗病其余的都不抗病 coloring
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玉米是雌雄同株的植物雄花着生在植株顶端的雄穗上雌花着生在茎杆中部叶腋间的雌穗上在一个育种实验中采用甜玉米甲非甜玉米乙两个品种的玉米 sketch template
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玉米是一种雌雄同株植物下表表示5个玉米纯系的表现型相应的基因型及基因所在的染色体其中 品系均只有一个性状属隐性其他性状均为显性 sketch template
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某育种专家在农田中现一株大穗不抗病的小麦自花受粉后获得160粒种子这些种子育成的小麦中有30株大穗抗病和若干株小穗抗病其余的都不抗病 sketch template
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题目玉米是一种重要的粮食作物也是遗传研究的良好材料通常是雌雄同株顶生雄花序侧生雌花序如图所示一株由紫色玉米粒育成的植株A与 sketch template
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题目下图为五种不同育种方法示意图请据图回答1图中A→D方所示的途径表示 育种方式A→B C的途径表示 育种方式这两种育种方式 sketch template
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知识库 玉米产业链专题研究玉米 新浪新闻 sketch template
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27．玉米是一种雌雄同株植物其顶部开雄花下部叶腋处开雌花已知甜玉米与非甜玉米为一对相对性状且甜玉米对非甜玉米为隐性为探究玉米籽粒中 sketch template
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如图为某农田生态系统示意图请据图回答1请写出此农田生态系统中能量损失最多的一条食物链禾谷类→昆虫→食虫鸟→鹰2在此生态系统的组成 sketch template
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史上最全的植物形态图解，值得珍藏！ 结构 sketch template
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9．如图为某农田生态系统示意图请据图回答1在此农田生态系统中昆虫吃草子鸟兔都禾谷类为食食虫鸟能够捕食昆虫又可被鹰捕食鹰还可 sketch template
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如图 列举了四种作物的育种方法请回答相应问题1上述育种方法中属于诱变育种的是 其形成的原理是 2在第种方法中若只考 sketch template
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某育种专家在农田中现一株大穗不抗病的小麦自花授粉后获得160粒种子这些种子育成的小麦中有30株大穗抗病和若干株小穗抗病其余的都不抗病 sketch template
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如图是某农田生态系统中的食物．请据图回答下列有关问题．1图中共有 条食物链．2图中农作物属于生态系统成分中的 初级消费者是鸟昆虫 sketch template
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如图表示某农田生态系统一年中CO2的释放和消耗状况其中各数字序号表达的含义分别为生产者吸释放量分解者吸释放量消费者吸释放量 sketch template
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某学校生物兴趣小组同学对某农田生态系统进行了调查分析并绘出了右图所示的食物．请据图回答1若要构成一个生态系统除图中所示生物外还应 sketch template
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