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某雌雄异株的一年生植物有紫花和白花两种花色.科学家利用紫花植株和白花植株进行了以下实验: 甲组:紫花植株多代随机交配,后代均为紫色个体; 乙组:纯种白色植株与纯种紫色植株杂交.无论正交、反交,F...
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高三下学期生物《》真题及答案
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某种雌雄同株植物的叶片宽度由等位基因D与d控制花色由两对等位基因A与aB.与b控制下图是花瓣细胞中色
南瓜是雌雄同株异花授粉植物由于有较多的容易区分的相对性状经常被用作遗传学实验材料I观察分析发现南瓜的
某雌雄异株二倍体植物为XY型性别决定该植物有蓝花和紫花两种表现型由两对等位基因A和a位于常染色体上B
一年生植物一年生植物
某雌雄异株二倍体植物为XY型性别决定该植物有蓝花和紫花两种表现型由两对等位基因A和a位于常染色体上B
进境一年生植物繁殖材料至少隔离两个生长期
34.14分某种雌雄同株植物的叶片宽度由等位基因D.与d控制花色由两对等位基因A.与aB.与b控制下
下图A.B.分别表示某雌雄异株植物M.的花色遗传及花瓣中色素合成的控制过程植物M.花色白色蓝色和紫色
34.14分某种雌雄同株植物的叶片宽度由等位基因D.与d控制花色由两对等位基因A.与aB.与b控制下
某种XY型性别决定的雌雄异株植物有蓝花和紫花两种表现型由两对等位基因
和a(位于常染色体)、
和b(位于X.染色体)共同控制,已知其紫花形成的生物化学途径如图所示.现有蓝花雄株(aaX
B
Y)与某紫花雌株杂交,F
1
中的雄株全为10紫花。雄性中X
B
Y、X
b
Y为纯合子。下列分析正确的是 ( )
A.某紫花雌株基因型为AAX
B
X
B
B.图中紫花形成过程说明基因可直接控制生物性状
F
1
的雌株中50%表现型为蓝花
该蓝花雄株与另一杂台紫花的后代中1/4为纯合子
一年生植物
某种一年生植物的白花授粉导致平均近交系数F=0.66问在随机杂交群体种基因型频率是多少
有一批开白花的植物在栽培过程中发现有一株开了紫花科学工作者把这株开紫花的植株的种子收集起来第二年种下
某种XY型性别决定的雌雄异株植物有蓝花和紫花两种表现型由两对等位基因
和a(位于常染色体)、
和b(位于X.染色体)共同控制,已知其紫花形成的生物化学途径如图所示。现用蓝花雄株(aaX
B
Y)与某紫花雌株杂交,F
1
中的雄株全为紫花。雄性中X
B
Y、X
b
Y为纯合子。下列分析正确的是 ( )。
A.某紫花雌株基因型为AAX
B
X
B
B.图中紫花形成过程说明基因可直接控制生物性状
F
1
的雌株中50%表现型为蓝花
该蓝花雄株与另一杂合紫花的后代中为纯合子
一二年生花卉裁培的种类不仅指一年生植物还包括在该地区按一年生植物生长的
二年生植物
多年生植物
多年生植物和二年生植物
球根花卉
某雌雄异株二倍体植物为XY型性别决定该植物有蓝花和紫花两种表现型由两对等位基因A和a位于常染色体上B
某种XY型性别决定的雌雄异株植物有蓝花和紫花两种表现型由两对等位基因
和a(位于常染色体)、
和b(位于X.染色体)共同控制,已知其紫花形成的生物化学途径如图所示。现用蓝花雄株(aaX
B
Y)与某紫花雌株杂交,F
1
中的雄株全为紫花。雄性中X
B
Y、X
b
Y为纯合子。下列分析正确的是
A.某紫花雌株基因型为AAX
B
X
B
B.图中紫花形成过程说明基因可直接控制生物性状
F
1
的雌株中50﹪表现型为蓝花
该蓝花雄株与另一杂合紫花的后代中1/4为纯合子
紫花苜蓿属于草本植物
一年生
二年生
三年生
多年生
08南宁二中5月模拟Ⅰ.有一批开白花的植物在栽培过程中发现有一株开了紫花科学工作者把这株开紫花的植株
紫花苜蓿属于草本植物
一年生
二年生
三年生
多年生
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下列说法与化学变化有关的是
Wearegoingtostudyinanewschoolin.九月
如图是某反应的微观示意图下列有关该反应的说法不正确的是
下列实验方法能达到实验目的是
完型填空 IalwaysthinkmydaughterKendallisthebest﹣that'sjustwhatparentsdo.Whenshewasonlythreeshe1forthepeoplelikealittleangel. WhenKendallwasfivewenoticedthatshe2hadatic面部抽搐.Whentheproblemgotworsewetookherfromdoctortodoctor.3thetreatmentKendallcontinuedtosing.Surprisinglyherticsdisappearedwhenshesang. WhenKendallwassixteenwethoughtshewouldbecuredsoon.Howeveran4thinghappened. AtapartyKendalljumpedonafriendforapiggybackride.Hebentlowerthansheexpectedandshejumped5thanheexpected.Kendallflewoverhisbackand6onthefloor﹣onherneck.Shewasrushedtohospitalparalyzed瘫痪fromtheneckdown.Shecouldn't7.Butherbiggest8wasn'twhethershewouldwalkagainbutwaswhethershecouldtryoutforashowcalledAmericanIdol. Asthedayswentonfeelingonherleftside9butshewasstillparalyzedontheright.Weweren'tsurehowmuchofher10wouldcomeback.Afriendbroughtamicrophoneandputitonherbed.EverydayKendalltriedhardtopickitup.Itwasmore11forhertopickupthatmicrophonethanaspoonorfork. Sometimesshehadtobiteatoothbrushtotakehermindoffthepain.Weallcriedbecauseofthe12wewitnessed.Butontheday﹣onlythreemonthsafterher13﹣wecriedfullofjoywhenshesang14shedidn'tentertheTop24ofAmericanIdol. Whenshewasalittlegirlsheaskedme15itwasshethathadtics.MyhearthurtbutItoldherKendallyouhaveapureheartafantasticvoiceastrongmind.Andyouareabeautifulpresence. 1A.danced B.sang C.jumped D.painted 2A.never B.sometimes C.seldom D.always 3A.During B.Before C.After D.Until 4A.useful B.exciting C.meaningless D.terrible 5A.farther B.nearer C.higher D.lower 6A.lay B.sat C.stood D.landed 7A.move B.sing C.eat D.think 8A.problem B.worry C.dream D.plan 9A.stopped B.remained C.returned D.disappeared 10A.movement B.treatment C.achievement D.entertainment 11A.interesting B.important C.helpless D.dangerous 12A.microphone B.toothbrush C.joy D.pain 13A.failure B.show C.tic D.accident 14A.though B.because C.if D.so 15A.who B.when C.why D.what
有一种润滑添加剂由镁粉铜粉氧化镁粉末中的一种或几种组成.步骤一取少量该添加剂加入足量稀盐酸有红色固体残留并产生大量气泡步骤二另取少量该添加剂加入一定量的硝酸银溶液充分反应后过滤得到滤渣和无色滤液.向滤渣中加入足量稀盐酸无明显现象. 1通过以上实验填“可以”或“不可以”证明镁铜银三种金属的活动性顺序. 2该添加剂的成分是用填化学式填空. 3步骤二的滤液中一定有用填化学式填空滤液中最多含种溶质.
下列物质溶于水能使溶液温度降低的是
下列说法正确的是
如图是元素周期表的一部分.下列说法正确的是
Thesilkscarfisprettyandherbluecoatverywell.match
2017年5月扬州市启动“公众看环保”活动下列做法不合理的是
阅读理解 Treesincitieslivefastbutdieyoungcomparedtoforestsinthecountrysidewarnsanewstudy. ResearchersfoundthattreesincitiesdieyoungerthanonesinthecountrysidebecauseofthehigherlevelsofCO2.City﹣livingtreessuffer遭受alossofcarbonstorage碳储量.Thatmeanstreesproducelessenergyfromtheair. Nowresearcherssaymoremustbedonetodealwiththesituation.IanSmithaPhDstudentofBostonUniversityintheUnitedStatessaidCitiesareintheimportantpositioninfightingagainstrisingtemperaturesandincreasingCO2..Wefindthattreeplantingalonemaynotbeenoughtokeepandincreasecitycanopycover树冠覆盖率.Becauseoftheageandsizeofthepresentcanopyeffortstoimproveandprotecttreehealtharebadlyneededforincreasingcitytreecoverandcanopycover. Theresearchteamusedamodeltowatchchangesamongstreettreesforseveralplantingandmanagementmethods.Researchersalsousedthemodeltowatchtreegrowthdeathandplantingrates率bothamongtreesinBostoncityandforestsinthecountrysideinMassachusetts. Itwasdiscoveredthatratesofcarboncyclingandgrowthratesamongcitytreeswerenearlyfourtimesfasterthanthoseinthecountryside.Howeverlossofcarbonstorageanddeathratesarealsohigherespeciallydeathratesaremorethandoublehigherthanthoseincountrysideforests. ThestudypublishedinPLOSONEhasremindedscientiststoencouragecommunitiestodomoretoplantandprotecttrees.Itisimportanttoincreasecitycanopycoverandcarbonstorage. Researcherssayplantingandprotectingwillbeneededtomakesurecitiescandevelophealthilybutmoreneedstobedonetohaveabetterunderstandingofcitytrees﹣﹣﹣whichmaybedifferentfromcountrysideforests. 1AccordingtothepassagewhichofthefollowingisTRUE? A.Themorecarbonstoragelosesthemoreenergythetreesproducefromtheair. B.ThehigherthelevelsofCO2aretheharderitwillbefortheplantstosurvive. C.Ifweplantenoughtreeswearesuretoincreasecitycanopycover. D.CitiesdobetterinfightingagainstrisingtemperaturesandincreasingCO2. 2Paragraph4mainlytellsus. A.theresultsofthestudy B.thediscoveriesfromtheresearchers C.themethodsofthestudy D.thesuggestionsfromtheresearchers 3WhatdoesthoseinParagraph5referto? A.Deathrates. B.Ratesofcarboncycling. C.Growthrates. D.Lossofcarbonstorage. 4Thewriter'smainpurposeofwritingthepassageis. A.toteachushowtoimproveandprotecttreehealth B.towarnusthattreesincitieslivefastbutdieyoung C.toletushaveabetterunderstandingofcitytrees D.totellustotakeactiontoincreasecitycanopycover
﹣AllofAudreyHepburn'sfilmsarewonderful. ﹣.EspeciallyRomanHoliday. A.Ican'agreemore B.That'snotthecase C.That'snotthepoint D.Don'tmentionit
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根据短文内容和首字母提示在下文空格处填入适当的词使短文完整 WeconfirmedthatJimwaslockedinthehut.Wespenttwonightsd1aholeunderthehut.WecameupunderJim'sbed.Hewasverysurprisedtoseeus.Wep2Jimtofreehimwhenwewereready.Thenweclimbedt3theholebacktoourbedroomandtalkedaboutaplan. Tomwantedtomakeanadventure.HewrotealettertoUncleSilastellinghimsomebodywasplanningtostealJim.Iputtheletterunderthefrontdoor.Wewaitedforthec4tofreeJim. ThenextnightsomemenwereinUncleSilas'ssittingroom﹣﹣allwithguns!Wejumpedoutofthebedroomwindowandclimbedintothehut.ComeonJim!Tomwhispered.Huckyougofirst.ThenyouJim.I'llgol5. WeheardsomebodyshoutingThethieveshaves6Jim!Wequicklyclimbedoutandrantowardsthefence. Wekeptrunninglikeourf7wereonfire.Wemadeittothefence.IjumpedoverthefenceandJimfollowedme.Tomwasrightbehindus.U8hecaughthistrousersonanail.Hepulledt9freebutthemenheardthenoise.Theystartedshooting.Werantotheriverandjumpedintothecanoe.Welaydownoutofbreath. Jim!You'reafreeman!Isaid.WewereallhappyandTomwastheh10. ItwasagreatadventureTomsaid.Andlook!Igotabulletinmyleg! Itwastrue.Hislegwasbleedingbadlybutheconsidereditaspartoftheadventure. ﹣﹣﹣﹣TakenfromTheAdventureofHuckleberryFinn
阅读理解 ThatmorningwenoticedacabfollowingSirHenryandDr.MortimerinLondon.Butwho? WewenttoSirHenry'shotel.HolmesaskedDr.MortimerifanyonewithablackbeardlivedinornearBaskervilleHall. YessaidDr.MortimerBarrymore. WemustsendatelegramtocheckwhetherBarrymoreisinLondonoratBaskervilleHallsaidHolmes. SirHenrysaidhewantedtogotoBaskervilleHall. OKsaidHolmes.Butyoumustn'tgoalone.Watsoncangowithyou. SirHenryandIagreedtotakethe1030trainonSaturday. HolmesthoughtdeeplyonthewayhomethestoryoftheHoundSirCharles'sdeaththestrangeletterthemissingbootandtheblack﹣beardedman.Hesatinhisroomallafternoonsmokingandthinking. Justbeforedinneratelegramarrived.ItsaidBarrymoreisatBaskervilleHall. ThatbecomesadeadendWatson.Wewillhavetolookforanotherwaytogoforward. Justthenthedoorbellrang.Itwasthecabdriverwhodrovethemanwiththeblackbeard.Igotamessagethatyouareaskingformehesaid.I'veneverhadacomplaint.Icameheretoaskyouwhatyouhadagainstme! NonosaidHolmes.InsteadI'llgiveyoumoneyifyoutellmeaboutthemaninyourcabthismorning.Hewatchedthishouseat1000andthentoldyoutofollowthetwogentlemen. ThedriverlookedsurprisedandthenansweredThemansaidhewasadetectiveandthatIshouldn'ttellanyoneabouthim. It'sseriousmyfriendandyoumaybeintroubleifyourefusetoanswer. HisnamesaidthedriverwasSherlockHolmes. I'dneverseenHolmesmoresurprised.Thenhelaughed.HescoredagainstmethattimeWatson. Thedrivertolduseverythingheknew.Holmesgavehimthemoneyandsenthimaway.ThisisadangerousenemyWatson. ﹣TakenfromTheHoundoftheBaskervilles 1AccordingtothepassagetheunderlinedphrasedeadendinParagraph10means. A.Holmeswantedtogiveupsolvingthecase B.theroadinfrontofBaskervilleHallwasclosed C.thecabdriverdidn'tfindhiswayandturnedround D.theydidn'tknowwhothemanwithablackbeardwas 2Accordingtothepassagewecanknowthatthecabdriver. A.wasasdangerousastheblack﹣beardedman B.receivedacomplaintfromtheblack﹣beardedman C.didn'tknowwhyHolmesaskedforhimatthebeginning D.didn'ttellHolmesanythingabouttheblack﹣beardedman 3BythesentenceHescoredagainstmethattimeHolmesmeansThemangainedanadvantageovermeby. A.watchingthishouseatteno'clock B.followingSirHenryandDr.Mortimer C.tellingthedriverhisnamewasHolmes D.askingthedrivertokeephissecret 4Whichofthefollowingisthecorrectorderaccordingtothepassage? a.Holmesreceivedthetelegram. b.ThecabdrivercametoseeHolmes. c.WatsonwasaskedtogowithSirHenry. d.Holmeswassurprisedandthenlaughed. e.WatsonandSirHenrytookthe1030train. A.cabde B.ceabd C.abcde D.acebd
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下列关于物质性质和用途的说法不正确的是
Letlifebebeautifullikesummerflowersanddeathlikeautumn.树叶
俗话说远亲不如近邻.近日某英文报正在举行题为MyNeighbourhood的征文活动.假如你是李雷住在花园社区根据以下流程图提示完成一篇英文征文稿. ConditionsWhatisyourneighbourhoodlike? Whatareyourneighbourslike? NeighbourhoodNeighboursHowdotheyhelpothers?givetwoexamples Whatdidyoudoforyourneighbours?giveoneexample FeelingsHowdoyoufeeltoliveinyourneighbourhood? 要求1表达清楚语法正确上下文连贯 2必须包括流程图中所有要点内容并适当发挥 3词数100词左右开头已给出不计入总词数 4不得使用真实姓名校名和地名等. Myneighbourhood MynameisLiLei.IliveinGardenNeighbourhood.
根据如图所示的实验回答问题. 1甲实验进行粗盐提纯实验时过滤的目的是. 2乙实验验证人体呼出气体中二氧化碳含量比空气中多时除了要检验两种气体样品的体积相同外还要控制相同. 3丙实验用pH试纸测定白醋的酸碱度时先用蒸馏水润湿试纸则测得结果与实际值相比选择“偏大”“偏小”或“相等”. 4丁实验中若观察到澄清石灰水变浑浊干冷的烧杯内壁有水雾出现则气体的组成中一定含有元素.
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我省明代科学家宋应星所著的天工开物中详细记述了金铜铁锌等金属的开采和冶炼方法记述的金属中金属活动性最强的是
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Followthatadviceandsoonyouwillsolvetheproblem.teacher
化学与生活密切相关. 1每100克巧克力中营养成分的含量如下表 ①表中2142千焦能量全部来自糖类吗填“是”或“不是”.葡萄糖C6H12O6完全烧焦后得到黑色物质说明葡萄糖含填元素符号. ②摄入元素不足填元素名称会导致骨骼疏松易得佝偻病.补充维生素C选择为宜填序号 a.猪肉b.青菜c.纯净水 2青岛汉河电缆作为民族品牌自主研发地产品质优价廉.电缆内一般是铜芯外面包有聚乙烯绝缘层.用纯铜制作铜芯主要是因为.
Inthepastmanyriverswereseriouslybutnowtheyarecleanedup.污染
下列做法不正确的是
下列物质可用作氮肥的是
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