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1、遗传学选择Chapter21.ThemostlikelyoutcomeofacrossbetweentwotallplantsisA.?tall:?dwarf.B.?tall:?medium:?dwarf.C.?tall:?dwarf.D.alltall.E.alldwarf.2.Thesecondgenerationresultingfromageneticcrossisthe___generation.A.P1B.F1C.F2D.F3E.P23.InMendel'speas,tallisdomin
2、anttodwarfandyellowisdominanttogreen.Apure-breedingtall,yellowplantiscrossedtoapure-breedingdwarf,greenplant.TheresultingoffspringareintercrossedtogenerateanF2generation.WhichoftheF2offspringphenotypeswillbreedtrue?A.yellow,tallB.yellow,dwarfC.green,tal
3、lD.green,dwarfE.noneoftheabove4.Theprobabilitythatachildinaparticularfamilywillinheritarecessivedisorderis?Iftheparentshavethreenormalchildren,whatistheprobabilitythattheirfourthchildwillinheritthedisorder?A.0B.?C.?D.?E.15.Somecombinationsofallelescause
4、problemssoseverethatthefetusceasestodevelop.SuchlethalallelecombinationsappeartoalterMendelianratiosbecauseA.thealleleismaskedinheterozygotes.B.carriersdonotconstituteaprogenyclass.C.recessivehomozygotesdonotconstituteaprogenyclass.D.lethalallelesareign
5、ored.E.noneoftheabove6.Agenemayhavemanyalleles,buteachindividualhasonlytwoallelesbecauseA.havingmorethantwoallelesisalwayslethal.B.apersonishaploid.C.apersonisdiploid.D.havingmorethantwoallelesunbalancesthechromosomes.E.noneoftheabove7.Anindividualheter
6、ozygousforfivedifferentgenescanproducehowmanygeneticallydifferentgametes?A.2B.4C.8D.16E.328.Giventhefollowingbiochemicalpathway:a?b?c?d?e?f,ifacellhasamutationthatblocksthestepbetweencandd,itwillgrowifgivensubstanceA.B.B.C.C.D.D.E.E.F.9.Awomanofbloodtyp
7、eOhasatypeOchild.AmanofwhichbloodtypecouldNOThavebeenthefather?A.AB.BC.ABD.OE.AorB10.Ageneticistcrossesaplantwithredflowerstoaplantwithwhiteflowers.Theoffspringincludeplantswithredflowers(1/4),pinkflowers(1/2),andwhiteflowers(1/4).Whichallele,redorwhite
8、,isdominant?A.redB.whiteC.bothD.neither,theyarecodominantE.neither,theyareincompletelydominant1211.Inaparticularcross,twored-floweredplantsproduceoffspringinaratioof9red:3pink:4whitE.Whichgenotypecouldhaveapinkphenotype?A.AABBB.A
