2018 英语周报 高一 课标 21答案

第二节书面表达【写作指导】类型:通知审题时态:一般将来时和一般现在时为主人称:第三人称为主丰富校生活Para.1h陈述举办竞赛的目的增强学生食品安全意识国作思时间:竞賽时间和报名截止时间Pa2赛的时间地点和方式地点学校大礼堂报告厅芋方式:问答Para.3呼吁同学们积极参加【佳作展台】Noticecontest concerning the subject is to be held in our scho. a knowledgeAimed at raising students' awareness of food safetyThe contest is scheduled in the school hall from 2: 00 pm to 4: 00 pmon November 27th. It mainly consists of two rounds. First, all competitorsare required to answer five questions about food safety. The top 20competitors will have the opportunity to compete in the second roundwhere they will be asked another five more challenging questions. If youare interested, please sign up at the Student Union office before November20thLooking forward to your active participation【亮点梳理】亮点词汇: aimed at, awareness, schedule,berequired to do, sign up亮点结构:分词短语作状语( Aimed at raising studIents'awareness ofod safety), where引导的非限制性定语从句( where they will be askedanother five more challenging

32.考查目标本题考查伴性遗传和变异的知识,旨在考查考生的理解能力、实验与探究能力和综合运用能力。思路点拨(1)常染色体的某一片段移接到W染色体上,属于染色体结构变异中的易位。变异家蚕的基因型为 AOZW,由于没有A或a基因的配子不育,故变异家蚕在减数分裂中能产生基因型为A、AW、OWλ3种可育配子。(2)普通白卿雄蚕的基因型为a/Z,其与限性雌蚕交配,子代在卵期即可进行雌雄筛选,说明限性雌蚕含有A基因,且A基因位于性染色体上,结合变异家蚕的基因型,可推知限性雌蚕的基因型为aZW。其培育过程如图所示:变异家蚕(AOZW)×普通白卵雄蚕(an/Z)F1黑卿雄蚕(AaZ)黑卵雌蚕(aOZW)黑卵雌蚕(AaZW3)普通白卵雄蚕(anZ)F2限性黑卵雌蚕(aZW)黑卵雌蚕(aOZW)白卵雄蚕(anZ)参考答案(除注明外,每空2分,共11分)(1)染色体结构变异(或染色体变异或易位,1分)3(2) aa/w aO/W黑该雌蚕的显性基因只位于W染色体上,其显性性状只能遗传给雌性子代

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