2022英语周报外研版10期答案

第一节One possible versionDear Fairy,Im pleased to hear that you want to learn something about Calligraphy Club in our school.The Calligraphy Club is divided into primary class and advanced class. Primary class is suitable for peopldewithout foundation while the teaching of advanced class is more specialized. There are two lessons a week foreach level. The classroom is on the third floor of Student Activity Center. The general requirements ofcalligraphy are very simple. In addition to mastering some basic skills, the most important thing is persistence.Each day the learners have to spare their free time to stick to practice.Finally, I suggest you can come to class to experience if you like. Then decide whether to join the club.ours truly,Li Hua

25.【答案】B【解析】该转基因棉花的细胞进行有丝分裂,最高可以含有6个B基因,A错误;图中一条染色体上抗虫基因B和抗干旱基因R连锁,减数分裂时,等位基因分离,非同源染色体上的非等位基因自由组合,减数分裂产生的配子(不含抗性基因的染色体用0表示)种类和比例为BRRR:BRR0:BR00:RR0:R00:000=1:2l:1:2:1,共6种,BRRR占18,B正确;结合B选项分析,该转基因棉花与普通棉花杂交,为测交,后代有的既抗虫也抗干旱,有的只抗旱,有的既不抗虫也不抗干旱,C错误;干旱条件下,不具备R的植株不存活,000配子的概率为1/8,则不能存活的概率为1/8×1/8=1/64,存活植株的概率为1-1/64=63/64,抗虫个体所占的比例为1(1/8×1/8+1/8×2/8+1/8×1/8+1/8×2/8+28×2/8+2/8×18+1/8×1/8+28×1/8+1/8×1/8)=48/64,故甲自交后代植株干旱条件下,存活植株中抗虫个体占48/63,D错误

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