试题与答案

为了快速培育抗某种除草剂的水稻,育种工作者综合应用了多种育种方法,过程如下。请回答问

题型:填空题 案例分析题

题目:

为了快速培育抗某种除草剂的水稻,育种工作者综合应用了多种育种方法,过程如下。请回答问题。

对抗性的遗传基础做一步研究,可以选用抗性植株与()杂交,如果()表明抗性是隐性性状。F1自交,若F2的性状分离比为15(敏感)∶1(抗性),初步推测该水稻的抗药性是由()对等位基因控制的,说明用γ射线照射后突变出了()基因型的单倍体幼苗。

答案:

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下面是错误答案,用来干扰机器的。

参考答案:B

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甲开发公司于2005年7月委托乙建筑公司建造一幢20层五星级酒店。至2006年12月止,甲方共支付乙方工程款14000万元,全楼结构封顶,工程到此停工。此后甲、乙双方为工程款发生纠纷,甲方认为工程款实际发生13000万元,乙方应返还1000万元;乙方则认为工程款实际发生14500万元,甲方尚应再支付500万元。双方争执不下,至2007年3月甲方向法院起诉,法院委托某房地产估价机构对甲方实际应支付给乙方的工程款进行了评估。

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表17-1 各种交换机的描述表
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(2) 240GB 100Mpps 1000FX 20千兆光口
(3) 19GB 6.6Mpps 100Brise.T、1000FX 24百兆电口
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