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某种鼠的黄色与鼠色是一对相对性状由一对等位基因aa控制正常尾与卷尾是一对相对性状由一对等位基因tt控制黄色卷尾鼠彼此杂交得 Template






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tomski某种鼠的黄色与鼠色是一对相对性状由一对等位基因aa控制正常尾与卷尾是一对相对性状由一对等位基因tt控制黄色卷尾鼠彼此杂交得 coloring
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某种鼠的黄色与鼠色是一对相对性状由一对等位基因Aa控制正常尾与卷尾是一对相对性状由一对等位基因Tt控制黄色卷尾鼠彼此杂交得 sketch template
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现有一中家鼠黄色鼠和灰色鼠杂交得到的子一代中黄色鼠和灰色鼠的比例是11子一代中黄色鼠进行交配子二代中的黄色鼠和灰色鼠的比例是21 sketch template
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某种鼠中毛的黄色基因Y对灰色基因y为显性短尾基因T对长尾基因t为显性且基因Y或T在纯合时都能使胚胎致死这两对基因是自由组合的现有两只 sketch template
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小鼠体色由位于两对常染色体上的两对等位基因控制．其中A基因控制黄色R基因控制色AR同时存在则皮毛灰色无AR则白色．一灰鼠和一 sketch template
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题目小鼠的毛色有Agouti色色黄色等几种类型控制小鼠毛色的基因位于常染色体上用AAvy和a表示控制毛色形成的相关基因研 sketch template
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题目小鼠毛色的黄毛与灰毛为一对相对性状由等位基因Bb控制尾形的弯曲与正常为另一对相对性状由等位基因Dd控制两对基因均不位于Y sketch template
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为了研究免疫的生同学们做了以下 实验步骤一取6只小白鼠做实验平均分成甲乙两组 步骤二取活的肺炎双球菌注入甲组的小白鼠体内 取 sketch template
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某种品系的鼠毛色灰色和黄色是一对相对性状学家进行了大量的杂交实验得到了如下结果由此推断不正确的是 杂交 亲本 后代 杂交A 灰色× sketch template
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某种鼠中毛的黄色基因Y对灰色基因y为显性短尾基因T对长尾基因t为显性且基因Y或T在纯合时都能使胚胎致死这两对基因是自由组合的现有两只 sketch template
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某种鼠的皮毛黄色是显性短尾是显性这两对基因位于常染色体上且两对基因独立遗传若基因A或T在纯合时都能使胚胎致死请分析冋答下列问题1 sketch template
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题目斯氏鼠种类众多是遗传学研究的常用材料下图是某种斯氏鼠2N＝44的一些基因在染色体上的排列情况该种成年鼠的尾长受三对等位基因A sketch template
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大鼠和小鼠是常用的实验动物其中的大白鼠是褐家鼠的白化种类请回答下列问题1野生褐家鼠对环境的适应性极强早在18世纪人们就现了白化 sketch template
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在香水玫的花色遗传中红花白花为一对相对性状受一对等位基因的控制从下面的杂交实验中可以得出的正确结论是 A．红花为显性性状B sketch template
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题目某种小鼠的体毛有色和白色受一对基因Aa控制两只毛小鼠杂交后代性状表现如图一分析回答1小鼠的毛和白毛是一对 性状 sketch template
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题目小鼠毛色的黄与灰尾形的弯曲与正常各为一对相对性状分别由等位基因Rr和Tt控制．在毛色遗传中具有某种纯合基因型的合子不能完成 sketch template
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某黄色卷尾鼠彼此杂交得子代6/12黄色卷尾2/12黄色正常尾3/12鼠色卷尾1/12导致出现上述遗传现象的主要原因是 A不 sketch template
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某种鼠中黄鼠基因A对灰鼠基因a显性短尾基因B对长尾基因b显性且基因A或b在纯合时使胚胎致死这两对基因位于非同源染色体上现有两只双杂合 sketch template
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某种鼠中毛的黄色基因Y对灰色基因y为显性短尾基因T对长尾基因t为显性且基因Y或T在纯合时都能使胚胎致死这两对基因是自由组合的现有两只 sketch template
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小家鼠毛色有黄色与灰色尾形有弯曲与正常两种类型．在毛色遗传中具有某种纯合基因型的合子胚胎期死亡．用多对表现型相同的小家鼠交配其中雌鼠基因 sketch template
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某种鼠群中黄鼠基因A对灰鼠基因a为显性短尾基因B对长尾基因b为显性且基因A或b在纯合时使胚胎致死这两对基因是独立遗传的现有两只双杂合 sketch template
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请根据不同鼠种毛色性状遗传研究的结果分析回答下列问题．1甲种鼠的一个自然种群中体色有褐色和色两种由一对等位基因控制．已知褐色为显性 sketch template
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小鼠的长尾与短尾是一对相对性状色与褐色为另一对相对性状其中一对等位基因位于常染色体上另一对等位基因位于X染色体上多只基因型相同的褐色 sketch template
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某种鼠中黄鼠基因A对灰鼠基因a显性短尾基因B对长尾基因b显性且基因A或b在纯合时使胚胎致死这两对基因位于非同源染色体上现有两只双杂合 sketch template
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16．小鼠的毛色是受两对等位基因控制的这两对基因分别位于两对常染色体上．据研究正常小鼠体内色素的形成是经过下列途径产生的多巴醌使小鼠 sketch template
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鼠的黄色和色是一对相对性状按基因的分离定律遗传研究现让多对黄鼠交配每一代中总会出现约1/3的鼠其余均为黄鼠由此推断正确的是A sketch template
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如图是某品系小鼠的某些基因在染色体上的排列情况该品系成年小鼠的体重受独立遗传的三对等位基因 A AD DF F 控制．这三对基因的遗传 sketch template
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题目大鼠的毛色由独立遗传的两对等位基因控制．用黄色大鼠与色大鼠进行杂交实验结果如图．据图判断下列叙述正确的是 A．黄色为显性性状 sketch template
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某种鼠中毛的黄色基因Y对灰色基因y为显性短尾基因T对长尾基因t为显性且基因Y或T在纯合时都能使胚胎致死这两对基因是自由组合的现有两只 sketch template
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某种品系的鼠毛色灰色和黄色是一对相对性状学家进行了大量的杂交实验得到了如下结果由此推断不正确的是杂交亲本后代杂交A灰色×灰色灰色杂交B sketch template
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某种鼠中黄鼠基因A对灰鼠基因a显性短尾基因B对长尾基因b显性且基因A或b在纯合时使胚胎致死这两对基因位于非同源染色体上现有两只双杂合 sketch template
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某种鼠中皮毛黄色为显性短尾为显性．基因A或b纯合会导致个体在胚胎期死亡．两对基因位于常染色体上相互间独立遗传．现有一对表现型均为黄色短尾 sketch template
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在豌豆杂交实验中高茎与矮茎杂交得F1F1自交所得F2中高茎和矮茎的比例为787∶277上述实验结果的实质是 A．高茎基因对矮茎基因有显性 sketch template
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某种品系的鼠的毛色为灰色和黄色灰色和黄色是一对相对性状控制性状的基因位于常染色体上．学家进行了大量的杂交实验得到了如下结果请根据表格 sketch template
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人类每条染色体上都有很多基因下图表示1号染色体上的几种基因对性状的控制及基因在染色体上的分布位置若不考染色体交叉互换据此不能得出的结论 sketch template
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某研小组研究小鼠毛色Aa的遗传进行了表的实验结果现基因型为AA的小鼠胚胎期死亡．有关说法错误的是 组别 亲代 子代 第一组 sketch template