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果蝇的体色由位于常染色体上等位基因B（灰色）、b（黑色）控制，但只含其中一个基因的个体无法发育．如图为果蝇培育和杂交实验的示意图，相关叙述正确的是（ ）
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高三下学期生物《》真题及答案
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从一个自然果蝇群中选出一部分未交配过的灰色和黄色两种体色的果蝇这两种体色的果蝇数量相等每种体色的果蝇
果蝇的某对相对性状由等位基因Gg控制且对于这对性状的表现型而言G对g完全显性受精卵中不存在Gg中的某
这对等位基因位于常染色体上，G基因纯合时致死
这对等位基因位于常染色体上，g基因纯合时致死
这对等位基因位于X染色体上，G基因纯合时致死
这对等位基因位于X染色体上，g基因纯合时致死
已知果蝇的直毛与非直毛是一对等位基因若实验室有纯合的直毛和非直毛雌雄果蝇亲本请你通过一代杂交试验确定
从一个自然果蝇种群中选出一部分未交配过的灰色和黄色两种体色的果蝇这两种体色的果蝇数量相等每种体色的果
从一个自然果绳种群中选出一部分未交配过的灰色和黄色两种体色的果蝇这两种体色的果蝇数量相等每种体色的果
果蝇的体细胞有8条染色体携带有l万个以上的基因以下叙述正确的是
控制果蝇性状的所有基因平均分布在8条染色体上
果蝇的同源染色体的同一位置上的基因是等位基因
果蝇的非等位基因可以位于同源染色体上
雌雄果蝇的体细胞内所含的基因数目相等
果蝇是遗传学实验常用的材料一对果蝇每代可以繁殖出许多后代.请回答1正常情况下雌果蝇体内具有4个染色体
从一个自然果蝇群中选出一部分未交配过和灰色和黄色两种体色的果蝇这两种体色的果蝇数量相等每种体色的果蝇
现有翅型为裂翅的果蝇新品系已知果蝇裂翅
对非裂翅(a)为显性。杂交实验如表二所示: 下列相关叙述中,不正确的是
A.亲本中裂翅果蝇为纯合子
决定翅型的等位基因可能位于常染色体上
决定翅型的等位基因可能位于X.染色体上
可利用非裂翅(♀)×裂翅( ♂)杂交组合,来 确定该等位基因位于常染色体上还是X.染色体上
已知果蝇的长翅和残翅性状是由位于第Ⅱ号同源染色体常染色体上的一对等位基因控制现有一批未交配过的纯种长
下列关于果蝇的叙述错误的是
体细胞中有4对同源染色体，3对常染色体，1对性染色体
白眼雄果蝇的白眼基因位于X染色体上，Y染色体上无等位基因
白眼雄果蝇产生的配子中一半含有白眼基因，一半不含白眼基因
白眼雌果蝇与红眼雄果蝇杂交，后代全部表现为红眼果蝇
从一个自然果蝇种群中选出一部分未交配过的灰色和黄色两种体色的果蝇这两种体色的果蝇数量相等每种体色的果
某种鸟类2N=76位ZW型性别决定其羽毛中的黑色素由等位基因A./a中A.基因控制合成且A.基因越多
从一个自然果蝇种群中选出一部分未交配过的灰色和黄色两种体色的果蝇这两种体色的果蝇数量相等每种体色的果
从一个自然果蝇种群中选出一部分未交配过的灰色和黄色两种体色的果蝇这两种体色的果蝇数量相等每种体色的果
06全国卷Ⅰ从一个自然果蝇种群中选出一部分未交配过的灰色和黄色两种体色的果蝇这两种体色的果蝇数量相等
果蝇的某对相对性状由等位基因Gg控制且对于这对性状的表现型而言G对g完全显性受精卵中不存在Gg中的某
这对等位基因位于常染色体上，G基因纯合时致死
这对等位基因位于常染色体上，g基因纯合时致死
这对等位基因位于X染色体上，g基因纯合时致死
这对等位基因位于X染色体上，G基因纯合时致死
已知果蝇的直毛与卷毛是一对相对性状受一对等位基因控制若实验室有纯合的直毛和卷毛此但雄果蝇本请你通过一
已知果蝇灰体和黄体受一对等位基因控制但这对相对性状的显隐性关系和该等位基因所在的染色体是未知的．若实
10分 已知果蝇长翅和小翅红眼和棕眼各为一对相对性状分别受一对等位基因控制且两对等位基因位于不同的
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小浩同学用天平量筒和水等器材测量小石块密度的实验中 1图甲是小浩在调节天平时的情景小丽指出了他在操作上的错误你认为错误之处是． 2小浩纠正了错误后调节好天平将石块放入左盘天平平衡时测出石块的质量如图乙所示小石块质量是g． 3如图丙所示量筒测出小石块的体积是cm3则小石块的密度是g/cm3． 4小丽同学做这个实验时没有用天平也测出了该石块的密度．她先按照小浩的方法测出石块的体积然后用体积为48cm3质量为12g的小泡沫块不吸水与小石块用细线捆在一起再次放入量筒中石块和泡沫块漂浮在水面上且有1/3的泡沫露出水面．石块和泡沫块放入量筒之前水面初始位置是28ml则石块和泡沫块放入量筒后水面应该在ml刻度处．小丽测出的石块密度应为g/cm3．
﹣﹣﹣Herfathertriedtothatnothingunusualhadhappened. ﹣﹣﹣Infactitwasnotserious. A.imagine B.pretend C.mean D.warn
IneversawmyfatherhomefromworklateorillnordidIeverseemyfathertakeanightoutwiththeboys.Hehadnobobbiesbutjusttookcareofhisfamily. For22yearssinceIlefthomeforcollegemyfathercalledmeeverySundayat900am.Hewasalwaysinterestedinmylife﹣howmyfamilywasdoing.ThecallsevencamewhenheandmymotherwereinAustraliaEnglandorFlorida. NineyearsagowhenIboughtmefirsthousemyfather67yearsoldspenteighthoursadayforthreedayspaintingmyhouse.Hewouldnotallowmetopaysomeonetohaveitdone.AllheaskedwasaglassoficedteaandthatIholdapaintbrushforhimandtalktohim.ButIwastoobusyforIhadalawpracticetorunandIcouldnottakethetimetoholdthepaintbrushortalktomyfather. Fiveyearsagomy71﹣year﹣oldfatherspentfivehoursputtingtogetheraswingset秋千formydaughter.AgainallheaskedwasthatIgethimaglassoficedteaandtalktohimButagainIhadlaundrytodoandthehousetoclean. ThemorningonSundayJanuary161995myfathertelephonedmeasusualthistimehehadseemedtohaveforgottensomethingswehaddiscussedtheweekbefore.IhadtogettochurchandIcuttheconversationshort. Thecallcameat440am.ThatdaymyfatherwassenttohospitalinFlorida.IgotonaplaneimmediatelyandIvowed发誓thatwhenIarrivedIwouldmakeupforthelosttimeandhaveanicelongtalkwithhimandreallygettoknowhim. IarrivedinFloridaat100ambutmyfatherhadpassedawayat912pm.Thistimeitwashewhodidnothavetimetotalkortimetowaitforme. IntheyearssincehisdeathIhavelearntmuchaboutmyfatherandevenmoreabouteverysingleday. 1Weknowfromthereadingthatthefather. A.likedtopainthouses B.hadnofriendsaroundhim C.wasnothealthyinhisyouth D.thoughtofhisfamilyashisall 2Whenherfatherpaintedherfirsthousethedaughter. A.couldonlyaffordaglassoficedtea B.wastoobusytotalktoherfather C.coulddonothingbutholdapaintbrush D.spenteighthoursadayworkingwithherfather 3OnJanuary161995thedaughterfeltthatherfather. A.seemedtobealittledifferent B.hadnotimetophoneherasusual C.becameinterestedinchurch D.hadforgottentodiscusssomethingswithher 4Inthereadingtheunderlinedphrase‘gettoknowhim'mostprobablymeans. A.gethimtoknowher B.knowmoreabouthim C.gethimtoknowhimself D.makehimwell﹣known 5Whichisthebesttitleofthereading? A.PaintingHouses B.Daughter'sFamily C.FatherandI D.Father'sphonecalls
FourHabitstoHelpYouSucceed Weallwanttosucceed.Forthosewhohavetriedandfailedsuccessseemsdifficulttounderstand.1. •Knowyourvalues. Findingyourvaluesisinlinewithcreatingmotivation.2Pickahandfulofthingsandwritethemdown.Remindyourselfofyourvalueseverydayandreflectonwhetheryouarehonoringthosevaluesthroughyourwork. •Pickagoalandfocusonit. Chooseonegoaltostartsomethinglargeenoughthatwillgiveyouasenseofachievementwhileadjustingwelltoyourvalues.Focusiskeyhere.3Ifyouperformmanytasksatatimeyoumightneverfinishyourprojectsbecausetheywilltakefartoolong. •Setatimeforsuccess. Setadateforsuccess.Knowwhenyouhopetorealizeyourgoal.4Bysettingatimelimityouaremakingtheprocessrealistic. •5. Failurecan'tbeavoidedwhenyoutakerisks.Byitsverydefinitionthedesiretosucceedmeansyouareriskingfailure.Manypeopletendtogiveupfartooearly.Don'tfallintothistrap!Usefailure.Treatitasagoodthingandgoon. A.Themorefocusedyouareononegoalthehigherchanceyouhaveofsuccess. B.Maketherightdecision. C.Ihavemadealistoffourhabitstohelpyousetgoalsandrealizethem. D.Don'tgiveupbecauseoffailure. E.Keepitrealisticwhilenotgivingyoutoomuchtime. F.Sitandreflectonwhatyouvaluemost. G.Pushyourselftobecourageousandtakethatnextstep.
假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.文中共有10处语言错误每句中最多有两处每处错误仅涉及一个单词的增加删除或修改. 增加把缺词处加个漏字符号∧并在其下面写出该加的词. 删除把多余的词用斜线\划掉.修改在错的词下划一横线并在该词下面写出修改后的词. 注意1.每处错误及其修改均仅限一词 2.只允许修改10处多者从第11处起不计分. Todaythenumberofthenetizens网民inourcountryhaveincreasedrapidlyyetmanyofthemdonotpayenoughattentiontothefamily.ItisnodoubtthatwebenefitmuchfromtheInternet.Foranexampleit'sconvenientforustogettheinformationsweneedandcommunicatewithourfriendsandrelatives.Meanwhileitcouldhelpuslearnthatishappeningbothathomeandabroad.ThereforenomatterhowattractivetheInternetisweshouldn'tseparatedfromourlovedones.WeshouldstopsurftheInternetandspendtimewithourfamiliesenjoyingthetimewhenyouaretogether.
如图是用动滑轮提升货物A的示意图．在竖直向上的拉力F的作用下使重400N的货物A在50s的时间里匀速竖直上升了10m．在这个过程中拉力F为250N不计绳重及摩擦．求 1动滑轮重G动2动滑轮的机械效率η3拉力F的功率P．
TomarrivedatthebusstationquiteearlyfortheLondonbus.ThebusforLondonwouldnotleaveuntilfivetotwelve.Hesawalotofpeoplewaitinginthestation.Somewerestandinginlinesandotherswerewalkingabout.Therewasagroupofschoolgirls.Theirteacherwascryingtokeeptheminorder.Tomlookedaroundbuttherewasnowhereforhimtosit. Hewalkedintothestationcafé.Helookedupattheclockthere.Itwasonlytwentytotwelve.Hefoundaseatandsatdownfacingalargemirroronthewall.JustthenJohnoneofTom'sfriendscameinandsatwithTom. Whattimeisyourbus?askedJohn. OhthereisplentyoftimeyetansweredTom. OhI'llgetyousomemoreteathensaidJohn. Theytalkedwhiledrinking.ThenTomlookedattheclockagain. Goodheavens!It'sgoingback﹣ward!hecried.Afewminutesagoitwastwentytotwelveandnowit'shalfpasteleven. YouarelookingattheclockinthemirrorsaidJohn. Tomwantedtokickhimselfforbeingsofoolish.Thenextbuswasnottoleaveforanotherhour.Hehasneverlikemirrorsincethen. 1TheLondonbusleft. A.at1155 B.at512 C.before1155 D.after1155 2Tomwentintothestationcafébecause. A.Johnaskedhimtohaveacupoftea B.hewantedadrinkthere C.hewouldmeetafriendofhis D.itwasearlyyetandhewantedtofindaplacetosit 3Whattimewasitinfactwhenhelookedattheclockinthemirror? A.Halfpasttwelve. B.Halfpasteleven. C.Twentytotwelve. D.Halfpastone. 4Whichofthefollowingistrue? A.Tommissedhisbus B.Hehaslikemirrorsincethen. C.Thenextbuswouldleavesoon. D.TomarrivedLondonontime.
小明在老师的指导下用小球和弹簧等器材进行了如下实验与探究不考虑空气阻力让小球从某高度处由静止开始下落到竖直放置的轻弹簧上如图甲在刚接触轻弹簧的瞬间如图乙小球速度为5.0m/s．从小球接触弹簧到将弹簧压缩至最短如图丙的整个过程中得到小球的速度v和弹簧缩短的长度△x之间的关系如图丁所示其中A为曲线的最高点已知该轻弹簧每受到0.1N的压力就缩短0.5cm并且轻弹簧在全过程中始终发生弹性形变． 1从小球接触弹簧到将弹簧压缩至最短的过程中小球速度的变化情况是 2当小球的速度为5.0m/s时弹簧产生的弹力F与小球的重力G的关系为FG大于/小于/等于当弹簧的压缩量最大时小球处于平衡/非平衡态． 3实验中所用小球的质量为kg全过程中弹簧中弹力的最大值为N．
﹣IlovetheInternet.I'vecometoknowmanyfriendsontheNet. ﹣.Fewofthemwouldbecomeyourrealfriends. A.Ican'tagreemore B.I'mpleasedtoknowthat C.That'sforsure D.That'snotthecase
如图是珠海航空展飞行表演时的情景以为参照物飞机是运动的飞机向后喷气却能向前飞行这是因为歼20战机飞行速度最大可达850m/s则30min内歼20最大飞行距离可达km．
ThereisanoldEnglishsayingLaughteristhebestmedicine.OnepersoncertainlywouldhaveagreedwiththisisNormanCousins. NormanCousinswastheeditorofamagazinecalledSaturdayReviewforalmostfortyyears.Healso1andspokeaboutworldpeaceandanti﹣warissues反战议题travelingtomanydifferentcountriestosharehis2. Inthe1960safterreturningtotheUnitedStatesfromabusyandtiringtriptoEurope.Mr.Cousinsgot3.Hediscoveredhehadastrangediseasethatcausedgreatpaininhisbones骨头. Inlessthanaweekafterhegotbackhecouldnot4it.Everymovethathemadewaspainful.Hewasnotableto5atnight.ThedoctortoldMr.Cousinsthattheydidnotknowhowtocure治疗hisproblemandhemightnever6theillness.Mr.Cousinshoweverrefusedtogiveuphope. Mr.Cousinsthoughtthattheillnesscouldbecausedby7thoughts.Hedidnotwanttotake8tocurehimself.Insteadhefeltthathappythoughtsorlaughtermightcurehisillness. Hebegantoexperimentonhimselfwhilestillinthehospitalbywatchingcomedyshowsontelevision.Mr.Cousinsquicklyfoundthattenminutesof9laughterduringthedaygavehimtwohoursofpain﹣freesleepatnight. Decidingthatthe10couldnothelphimMr.Cousinsleftthehospitalandcheckedintoahotelroomwherehecould11hisexperimentswithlaughter.ForeightdaysMr.Cousins12inthehotelroomwatchingcomedyshowsontelevisionreadingamusingbooksandsleepingwheneverhefelt13.WithinthreeweekshefeltwellenoughtotakeavacationtoPuertoRicowherehebeganrunningonthebeachfor14. AfterafewmonthsMr.Cousinswas15tocarryonhiswork.Hehadlaughedhimselfbacktohealth. 1A.laughed B.taught C.wrote D.copied 2A.magazines B.subjects C.photos D.ideas 3A.rich B.sick C.lonely D.famous 4A.stand B.realize C.face D.improve 5A.dream B.eat C.shout D.sleep 6A.gothrough B.lookafter C.getover D.findout 7A.unhappy B.pleasant C.silly D.clever 8A.food B.time C.medicine D.money 9A.unusual B.false C.real D.wild 10A.friends B.laughter C.experiment D.doctors 11A.begin B.end C.continue D.report 12A.rested B.worked C.studied D.played 13A.well B.tired C.afraid D.worried 14A.help B.exercise C.freedom D.fun 15A.able B.safe C.lazy D.uncertain
如图所示是某家用电器的内部电路图其中R1和R2为加热电阻1234分别为四个接线柱．若要让两电阻串联接入电路则将接线柱与接线柱3连接此电路中不能将接线柱与接线柱3相连否则造成短路．电功率最大的连接方法是将接线柱1和3连接同时将接线柱连接起来．
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A.亲本中裂翅果蝇为纯合子 决定翅型的等位基因可能位于常染色体上 决定翅型的等位基因可能位于X.染色体上 可利用非裂翅(♀)×裂翅( ♂)杂交组合,来 确定该等位基因位于常染色体上还是X.染色体上
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