2022高一34期英语周报答案

第二节书面表达【写作思路】根据试题要求,考生需要写一篇记叙文,记述身边一位值得尊敬和爱戴的人。首先考生需要介绍自己最尊敬和爱戴的人是谁,简单地介绍一下他(她)。然后,陈述为什么他(她)值得尊敬和爱戴。最后,可以对前文进行一个总结,使文章结构严谨。本文的写作重点在"尊敬和爱戴的原因",考生可围绕这个要点适当拓展,从性格特点、处事风格等方面展开写作。【范文赏读】The most beloved and respected person around me is my teacher, Ms LiThough she has been teaching English for twenty years, she is still passionateabout teaching. She is kind and considerate towards us just like our dear motherWe all respect her because she always tries new ways to make her classes livelyand interesting. Hardworking and knowledgeable, she is one of the best teachersin our school. When we have a problem, we will turn to her for help. She alwaystalks to us patiently and helps us to find a solution. In our eyes, she is not onlyour teacher, but also our best friend. Those are why she deserves our respect【亮点词句】亮点词汇: beloved, respected, be passionate about, be consideratetowards, turn to sb. for help, in one's eyes亮点句式:Why引导的表语从句( why she deserves our respect)

38.(12分,每空2分)(1)1/32(2)紫花白花=1:1紫花白花=31:1紫花:白花=7:1紫花:白花=7:11/9【解析】(1)如果假设①正确,则亲本的基因型为AA和aa,F1的基因型为Aa,F2中白花植株所占的比率1/(63 1)=164。F1紫花植株产生的雌配子中a的概率为1/2,A配子的概率为1/2,故F1紫花植株产生的可育雄配子中a的概率是(164)/(1/2)=/32(2)验证上述①假设当E1作为母本进行测交时,即Aa×aa,则雌配子中a的概率为1/2,A的概率为1/2,雄配子的基因组成为a,故子代的基因型及比例为Aaa=1:1子代表现型及比例为紫花:白花=1:1当F1作为父本进行测交时,即Aaxa,则雄配子中a配子的概率为1/32,A配子的概率为31/32,雌配子的基因组成为a,故子代的基因型及氵比例为Aa:aa=(31/32):(1/32)=31:1,子代表现型及比例为紫花白花=31:1。验证上述②假设:不管F1作为母本,还是父本,进行测交时,均为AaB-bCc× aabbcc,子代中只有基因型为abec的植株为白花植株,其余均为紫花植株。子代中基因型为abbc植株所占的比例为1/2×1/2×1/2=1/8,故紫花:白花=(1-1/8):(1/8)=7:1。如果实验证明假设②是正确的,F1紫花植株进行自交,即 AaBbCc氵AaBbCc,F2中的紫花植株所占的比例为63/(63 1)=63/64,其中纯种所占的比例为(1/2×1/2×1/2-1/64)/(63/64)=1/9。

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