慕华优策2021-2022学年高三第二次联考 答案

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14D命题意图本题考查染色体结构变异、减数分裂中基因重组、分离定律和自由組合定律的相关知识,意在考查考生的理解能力、分析推理能力和获取信息的能力解题思路亲本雌果蝇的基因型是ⅹ"X,表现型是红色棒眼,A正确:雌雄果蝇杂交的子代中雄果蝇有四种表现型,即红色正常眼粉红色棒眼、红色棒眼和粉红色正常眼,对应的基因型分别是ⅹY、x"YXY、xY,所以母本产生了X、x"、X"、X四种配子,母本基因型是X"X,正常情况下可产生X、X两种配子,因此亲本雌果蝇减数分裂时同源染色体上的非姐妹染色单体之间发生了交叉互换B正确;母本产生了X、X、X"、X四种配子,父产生了ⅹ、Y2种配子,所以子代中的雌果蝇基因型是Ⅹ"Ⅹⅹ"ⅹ、ⅹⅹ,表现型依次是红色正常眼、粉红色棒眼、红色棒眼、粉红色正常眼,C正确;该生殖过程中发生的可遗传变异包括基因重组和染色体变异,D错误。

【写作提示】1.审题:(1明确故事人物:本故事中主要人物为作者、作者的女儿伊丽莎白;(2)厘清主要事件:作者的女儿伊丽莎白要参加游泳比赛,赛前很紧张,害怕游不好;比赛时遇到突发状况,但是通过和队友的共同努力羸得了比赛。2写作要点:{1)伊丽莎白在队友的帮助下穿上了脱落的袜子,并最终赢得了比赛:(2)伊丽莎白同作者分享比赛过程和胜利后的喜悅。【参考范文】Everybody on her leam started screaming "Elizabeth! Get the sock!However, she couldn' t hear them. A girl on my daughter's team jumped inthe pool, grabbed the sock, and swam after Elizabeth. "You have to putthe sock on, the girl screamed. Elizabeth continued swimming while hteammate put on the sock for her. The girl in lane two was about to passElizabeth. With the sock finally on, Elizabeth tried her best to swim thelast 25 meters. It was close, but Elizabeth beat the other girl to the wallfor the victoryOn the ride home, she shared her moment of winning again andagain. She talked about how seared she was when someone grabbed herfoot, how funny it was when she came to the finish and how great thenight was. She told me that if the T-shirt relay was an Olympic event,heream would win the gold medal. I told her that in my professional opinionshe was absolutely right【点评】该范文围绕原文内容进行了非常合理的续写,紧扣语境,与原文逻辑紧密,详略得当。由第一段首句内容“团队中的每个人都开始大喊伊丽莎白!拿袜子可知,第一段可描写她听不见大家的减叫声,一个女孩跳进水中帮她穿上了袜子,面临对手即将超越自己她拼尽全力取得了胜利。由第二段首句内容“在回家的路上,她一次又一次地分享自己赢得胜利的时刻”可知,第二段可描写她回想比赛过程中的感受以及对这次经历的感想。作者表示赞同女儿的心态和努力行文中不乏较为高级的表达,如 continue doing sth., be about to do sth.beat sb to sth., In one' sopInion以及with复合结构when引导的时间状語从句、tht引导的宾语从句等,使得语言表达生动多样。