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22.(13分,除标注外,每空2分)(1)具备优良性状的杂交种自交,其后代会发生性状分离(2)①aP、ap3②AaPp(3)甲与乙杂交得到杂交一代,杂交一代与丙杂交,得到杂交二代,杂交二代自交,收获种子,播种种子选育出表型为矮茎抗病正常叶的植株(答案合理即可,3分)【解析】(1)水稻杂交种的白交后代会发生性状分离故需每年制种。(2)①Ⅱ的基因型为aaPp,而含基因P的植株产生的雌配子直接发育成个体,故其种子胚的基因型为aPap.Ⅲ的基因型为Aapp,含基因A的植株产生的雌配子中染色体数加倍,故其所结种子胚中有3个染色体组。②子代N的基因型为ABPp,作为母本,其减数第一次分裂异常,配子基因型仍为AaPp,直接发育为基因为AaPp的个体。
第一节、短文改错(共10小题,每小题1分,满分10分)Inyoure-mail,youaskedmeforsomesuggestionsabouthowtohaveahealthyfamily.Hereismyadvices.Generallyspeaking,ahealthyfamilyneedeffortsofeveryfamilymember.First,itadviceneedsisobviousthatparentsshouldtreattheirchildrenequal,whichisimportantwiththefamily.What’sequallyformore,childrenandparentsbothbenefitfromhavesomeday-to-dayroutines.Inadditionto,everyhaving去掉membershouldgiveanothermemberscareandsupport.Finally,youshouldloveyourownotherfamily.Intheword,ifyouwanttoownahealthyfamily,itisthepositiveattitudewhichisofathatgreatimportance.IwouldappreciateAverymuchifyoucouldgivemeyourownopinion.it第二节书面表达(满分25分)DearLucy,I’msorrytohearthatyouarehavingtroubleinmakingfriendsinyournewschool.SoI’dliketogiveyousometips.Firstly,makeeyecontactwithotherswhiletalkingwiththem;smileatthemwhentheylookatyou,andlaughwhentheysaysomethingfunny.Secondly,beconfident.There’snothingthatattractspeoplemorethansomeonewhohasafairlypositiveatttudetowardslife.Thirdly,inviteotherstodothingstogether.Forexample,youcanaskthemtoshareatableatdinner.Besides,ifyoudon’tagreewithothers,doremembernottoarguewiththembutdiscusswiththem.Finally,offeryourhelpwhenevertheyareintrouble.Asthesayinggoes,“Afriendinneedisafriendindeed.”Ihopeyouwillfindmytipshelpful,andI’msurethatyou’llmakemoreandmorenewfriendsifyoutryyourbest.
