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已知某雌雄异株植物花色的遗传受两对等位基因（A和a、B和b）控制．酶1能催化白色前体物质转化为粉色物质，酶2能催化粉色物质转化为红色物质，酶1由基因A控制合成，酶2由基因B或b或控制合成，已知基因B...
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高三下学期生物《》真题及答案
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某雌雄异株植物为XY型性别决定其花色白色蓝色和紫色是由常染色体上的两对独立遗传的等位基因A.和aB.
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
某植物的花色由两对等位基因控制且两对等位基因独立遗传纯合的蓝色品种与纯合的紫色品种杂交F1为蓝色F1
6
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某自然种群的雌雄异株植物为XY型性别决定该植物的花色白色蓝色和紫色是由常染色体上的两对独立遗传的等位
某自然种群的雌雄异株植物为XY型性别决定该植物的花色白色蓝色和紫色由常染色体上的两对独立遗传的等位基
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
某自然种群的雌雄异株植物为XY型性别决定该植物的花色白色蓝色和紫色由常染色体上的两对独立遗传的等位基
甜豌豆的紫花是一对相对性状由两对等位基因
和a、
和b）共同控制，其显性基因决定花色的过程如图所示，下列描述不正确的是：
A.甜豌豆的花色遗传说明某些生物性状是由两对或多对等位基因共同控制的B.甜豌的花色性状是通过基因控制蛋白质分子的结构来直接影响性状的
两株白花甜豌豆杂交，后代不可能出现紫花甜豌豆
甜豌豆控制花色基因的遗传不符合孟德尔遗传定律
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
甲乙丙三种植物的花色遗传均受两对等位基因的控制且两对等位基因独立遗传每对等位基因中显性基因对隐性基因
43.6分某自然种群的雌雄异株植物为XY型性别决定该植物的花色白色蓝色和紫色是由常染色体上的两对独立
某株植物的基因型为AaBb则下列有关叙述不正确的是
如果该植物自交，后代有两种表现型，说明该植物的等位基因A和a的遗传不遵循孟德尔的基因分离定律
如果两对等位基因遵循自由组合定律，让该植物与基因型为aabb的植株杂交，产生的子代基因型有4种
如果两对等位基因遵循自由组合定律，该植物自交后代如有三种表现型，则子代中表现型不同于亲本的个体所占比例可能为7/16
如果该植物的性别决定方式属于XY型，且A和a于性染色体上，则不能确定该株植物一定是雌个体
某植物的花色有蓝花和白花两种由两对等位基因A和aB.和b控制下表是两组纯合植株杂交实验的统计结果有关
控制花色的这两对等位基因的遗传遵循自由组合定律
第①组F
2
中纯合蓝花植株的基因型有3种
第②组蓝花亲本的基因型为aaBB或AAbb
白花植株与第②组F
1
蓝花植株杂交，后代开蓝花和白花植株的比例为3∶1
某自然种群的雌雄异株植物为XY型性别决定该植物的花色白色蓝色和紫色是由染色体上的两对独立遗传的等位基
女娄菜是一种雌雄异株的二倍体植物其花色遗传由两对等位基因A.和aB.和b共同控制如图甲所示.其中基因
某植物花色遗传受A.a和B.b两对等位基因控制两对基因独立遗传当不存在显性基因时花色为白色当存在显性
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
某植物的花色由两对等位基因控制且两对等位基因独立遗传纯合的蓝色品种与纯合的紫色品种杂交F1为蓝色F1
3种 6种
2种 3种
4种 4种
2种 4种
某自然种群的雌雄异株植物为XY型性别决定该植物的花色白色蓝色和紫色是由常染色体上的两对独立遗传的等位
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﹣﹣﹣Thedoorisopen.SomeonehavecomeinwhileIwasout. ﹣﹣﹣Really?Youcallthepoliceimmediately. A.mightmust B.canneed C.mustmust D.mustcan
谋生.
8分Youwakeupinthemorningthedayisbeautifulandtheplansforthedayarewhatyouhavebeenlookingforwardtoforalongtime.Thenthetelephoneringsyousayhelloandthedramastarts.Thepersonontheotherendhasadepressingtoneinhisvoiceashestartstotellyouhowterriblehismorningisandthatthereisnothingtolookforwardto.Youarestillinawonderfulmood?Impossible! Communicatingwithnegativepeoplecanwashoutyourhappiness.Itmaynotchangewhatyouthinkbutcommunicatinglongenoughwiththemwillmakeyoufeeldepressedforamomentoralongtime.Lifebringsupsanddownsbutsomepeoplearestuckinthewrongideathatlifehasnohappinesstooffer.Theyonlyfeelgladwhentheymakeothersfeelbad.Nowondertheycanhardlywinothers'pityorrespect.Whenyoucommunicatewithpositivepeopleyourspiritstayshappyandthereforemorepositivethingsareattracted.Whenthedagger匕首ofanegativepersonisputinyouyoufeeltheheavyfeelingthatallinallbringsyoudown. Sometimeswehavenochoicebuttocommunicatewithnegativepeople.Thiscouldbeaco﹣workerorarelative.Inthiscasesaywhatneedstobesaidaslittleaspossible.Sometimesitfeelsgoodtoletoutyourangerbacktothenegativepersonbutallthisistoloweryoutothatsamenegativelevelandtheywon'tfeelashamedofthemselvesaboutthat. Negativityoftenaffectshappinesswithoutevenbeingrealized.Thenegativewordsofanotheratthestartofthedaycanclingto附着youthroughouttherestofyourdaywhichmakesyoufeelbadandstealsyourhappiness.Lifeistooshorttofeelnegative.Staypositiveandavoidnegativityasmuchaspossible. 21.Thepurposeofthefirstparagraphisto. A.makeacomparison B.offeranevidence C.introduceatopic D.describeadailyscene 22.Howcannegativepeoplehaveeffectonus? A.Bychangingourwaysofthinking B.Bytellingusthenatureoflife C.Byinfluencingouremotion D.Bycomparingtheirattitudestolifewithours 23.Somenegativepeoplebasetheirhappinesson. A.otherpeople'srespectforthem B.otherpeople'spityforthem C.buildingupapositiveattitude D.makingotherpeopleunhappy 24.Accordingtothepassagetoreducenegativepeople'sinfluenceonusweareadvisedto. A.showourdissatisfactiontonegativepeople B.communicatewithnegativepeopleaslittleaspossible C.changenegativepeople'sattitudestolife D.makenegativepeoplefeelashamedofthemselves.
HarrywaspthatNicholasdidn'tseemtorecognizehim. Itmeansyoudon'tunderstanditorfeelconfused
Wefinallyboughtahousemabouttwelvefeetbyfifteenfeet.Itreferstothingscanbeexpressedinnumberssuchasthelengthorwidth
感到高兴振奋.
WhenIlivedinSpainsomeSpanishfriendsofminedecidedtovisitEnglandbycar.Beforetheylefttheyaskedmeforadviceabouthowtofindaccommodation住所.Isuggestedthattheyshouldstayat‘bedandbreakfast'housesbecausethiskindofaccommodationgivesaforeignvisitoragoodchancetospeakEnglishwiththefamily.Myfriendslistenedtomyadvicebuttheycamebackwithsomefunnystories. Wedidn'tstayatbedandbreakfasthousestheysaidbecausewefoundthatmostfamilieswereawayonholiday. Ithoughtthiswasstrange.FinallyIunderstoodwhathadhappened.MyfriendsspokelittleEnglishandtheythought‘VACANCIES'meant‘holidays'becausetheSpanishwordfor‘holidaysis‘vacancies'.Sotheydidnotgotohousewherethesignoutsidesaid‘VACANCLES'whichinEnglishmeanstherearefreerooms.Thenmyfriendswenttohousewherethesignsaid‘NOVACANCLES'becausetheythoughtthismeantthepeoplewhoownedthehousewerenotawayonholiday.Buttheyfoundthatthesehouseswereallfull.Asaresulttheystayedathotels! Welaughedaboutthisandaboutmistakesmyfriendsmadeinreadingothersigns.InSpanishtheword‘DIVERSION'meansfun.InEnglishitmeansthatworkmenarerepairingtheroadandthatyoumusttakeadifferentroad.Whenmyfriendssawtheword‘DIVERSION'onaroadsigntheythoughttheyweregoingtohavefun.Insteadtheroadendedinalargehold. Englishpeoplehaveproblemstoowhentheylearnforeignlanguages.OnceinParis.WhensomeoneofferedmesomemorecoffeeIsaid‘Thankyou'inFrench.ImeantthatIwouldlikesomemoreHowevertomysurprisethecoffeepotwastakenaway!LaterIfoundoutthat‘Thankyou'inFrenchmeans‘Nothankyou.' 5.MySpanishfriendswantedadviceabout. A.learningEnglish B.findingplacestostayinEngland C.drivingtheircaronEnglishroads D.goingtoEnglandbycar 6.Isuggestedthattheystayatbedandbreakfasthousesbecause. A.theywouldbeabletopracticetheirEnglish B.itwouldbemuchcheaperthanstayinginhotels C.itwouldbeconvenientforthemtohavedinner D.therewouldbenoproblemaboutfindingaccommodationthere 7.NOVACANCIESinEnglishmeans. A.nofreerooms B.freerooms C.notawayonholiday D.holidays 8.WhensomeoneofferedmemorecoffeeandIsaid‘Thankyou'inFrenchI. Adidn'treallywantanymorecoffee B.wantedthemtotakethecoffeepotaway C.reallywantedsomemorecoffee D.wantedtoexpressmypoliteness.
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A.甜豌豆的花色遗传说明某些生物性状是由两对或多对等位基因共同控制的B.甜豌的花色性状是通过基因控制蛋白质分子的结构来直接影响性状的 两株白花甜豌豆杂交，后代不可能出现紫花甜豌豆 甜豌豆控制花色基因的遗传不符合孟德尔遗传定律
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