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第一节One possible versionDe[文]ar Sir/Madam[章]Knowing the Internati[来]onal Book Fair will be held nextweek in our city and that some volunteer[自]s are needed. I amwriting[知] to recommend[嘛] myselfThe[答] following[案] are my advantage[网]s. First of all, I speakEngl[文]ish so fluently that I have no difficult[章]y communica[来]tingwith foreigner[自]s. Secondly,[知] as a monitor, I always organizea[嘛]ll kinds of social activitie[答]s. More important[案]ly, I am a reg-stere[网]d volunteer[文], so I have gained rich experienc[章]e in volenteri[来]ng.I would appreciat[自]e it if I were given a chance. Lookingfo[知]rward to your early reply.You[嘛]rs.Li Hi第二节One possible versionLa[答]ter that evening, my son came up to me, his handbehin[案]d his back. "I have something[网] for you, Daddy, "hesaid. Beyond my expectati[文]on, he handed me a KenGriffe[章]y, Jr. card. He'd taken a pair of scissors and cutone copy of the Griffey off from the box. Now you don'thave to look for it anymore, "he said. Hearing what hesaid,I was shocked, and moved to tears. At once, the hugI gave him was the best price I ever paid for a cardI continued[来] collectin[自]g, and even ended up buying andsellin[知]g some old and valuable cards. However, there wasone card that I would never trade, which was a KenGriffe[嘛]y, Jr. card. Up to now, I still keep that Griffey, Jrcard, even if it has had the rough borders and the shabbycor[答]ners, and there is only a plain and simple board on theback. That is because that card. to me, is what baseball isall about. More important[案]ly, it's also what loveall about
,合理卧可。32.[网]答案:(1)自由组[文]合定律(1分)与眼[章]型有关的基因位于X[来]染色体上,与翅型有[自]关的基因位于常染色[知]体上,两对基因分别[嘛]位于两对同源染色体[答]上,遵循自由组合定[案]律(2分)(2)1[网]2(1分)14(1[文]分)(3)4(1分[章]4)实验思路:将该[来]残翅果蝇与纯合的长[自]翅果蝇(EE)杂交[知],获得F1,让F1[嘛]自由交配获得F2,[答]观察并统计F2的表[案]现型和比例(1分预[网]期结果和F2表现型[文]比例为长翅残翅=3[章]:1,则该残翅果蝇[来]的出现是由于亲本果[自]蝇在形成配子的过程[知]中发生基因突变导致[嘛]的;若F2表现型比[答]例为长翅残翅=4:[案]1则该残翅果蝇是由[网]于亲本果蝇减数分裂[文]过程中染色体片段缺[章]失所引起的(3分)[来]果纯围眼律号10和[自]1,说明该状与别相[知]关联:与眼型有关的[嘛]务有关的基因位于常[答]染色体上,且某基因[案]型胚胎致死,两对基[网]因分别位于两对同源[文]染色体上,遵循自由[章]组合定律。(2)由[来]于亲本的基因型为A[自]a×Aa,F1中由[知]于AA基因型胚胎致[嘛]死,F1基因型比例[答]为Aaa=21,A[案]基因频率为1/3,[网]a基因频率为2/3[文],由于F1自由交配[章],F2中AA占19[来],Aa占49,a占[自]4/9,由于AA基[知]因型个体胚胎致死,[嘛]因此F2中Aa:a[答]=1(3)用荧光标[案]记的含有E和e基因[网]序列作为探针进行分[文]子杂交,这只长翅雄[章]果观察到4个荧光点[来],若该对基因位于X[自]染色体上,基因型应[知]该为 XEXEYY或者位[嘛]于常染色体合长翅杲[答]蝇(EE)与残翅果[案]蝇(Ee)杂交,正[网]常子代都为Ee,表[文]现型都为长翅,但子[章]代出现了一只残翅果[来]蝇,出现该果蝇的原[自]因可能是基因突变或[知]者染色体片段缺失所[嘛]引起的,为探究该残[答]翅杲蝇产生的原因,[案]实验思路将该残翅杲[网]蝇与纯合的长翅果蝇[文](EE)杂交,获得[章]F1,让F1自由交[来]配获得F观察并统计[自]F2的表现型和比例[知]。预期结果和结论:[嘛]若该残翅果蝇的出现[答]是由于亲本果蝇在形[案]成配子的过程中发生[网]基因突变导致的,则[文]该残翅果蝇的基因型[章]为e弋全为Ee,F[来]1自由交配,F2的[自]基因型比例为减数分[知]裂过程中染色体片段[嘛]缺失所引起的,则该[答]残翅果蝇的基因型为[案]eo(“o”本杂交[网],F1基因型为Ee[文]EO=11本果蝇在[章]形成配子的过程中发[来]生基因突变导致的,[自]则该残翅果境的基因[知]为e代全为Ee,F[嘛]1自由交配,F2的[答]基因型比例为Ee1[案]21.2表现型比为[网]长想戏如果该残翅果[文]蝇是由于亲本果蝇分[章]裂过程中染色体的,[来]则该残翅果蝇的基因[自]型为eOO产生的配[知]子及其比例为1/2[嘛]E、14e和114[答]0,F2自由交配的[案]比例为下表,由下表[网]格可得出,F2表现[文]型比例为长超翅4雄[章]配子学肥子+1美死[来]74e1/8Ee1[自]716ee1/16[知]活塞压缩引火仅内的[嘛]气
