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18.D【解析】根[文]据题意,蝴蝶基因型[章]和表现型的对应关系[来]为黄色雄性T2B+[自]Z-(6种),蓝色[知]雄性T_zZ(4种[嘛]),白色雄性(tt[答]z-(6种)、TZ[案]2(2种)),黄色[网]雌性TzB+W(2[文]种),蓝色雌性T_[章]2W(2种),白色[来]雌性(t-W(3种[自])、TzW(2种)[知]),故蝴蝶的体色为[嘛]黄色的基因型有8种[答],白色的基因型有1[案]3种,黄色个体的基[网]因型种类少于白色个[文]体,A错误;体色为[章]蓝色雌蝶个体的基因[来]型为T2W所产生的[自]卵细胞中不一定含有[知]基因B。含有基因B[嘛]的概率是1/2,含[答]有W染色体的概率是[案]1/2,B错误;若[网]体色为白色蝴蝶的雌[文]雄个体杂交,后代可[章]能出现三种表现型,[来]如亲本白色的基因型[自]为 Ttzwxttz"+Z°,后代可产生[知]黄色、蓝色和白色3[嘛]种体色,C错误;若[答]基因型为TtZW和[案]Ttzz的个体杂交[网],后代出现白色个体[文](T2W、tt)的[章]概率为3/4×1/[来]4+1/4=7/1[自]6,D正确。
短文改错A professor[知] gave a balloon to every student, whom had to write their name on it or throw it in thewhoand[嘛]hallway. The professor[答] then mixed all the balloon, The students were given 5 minutes to find their ownballoo[案]nsballoon[网].Despite of a busy search, no one found their balloon. At that point the professor[文] told the students totaking the first balloon that they found and hand it to A person whose name was written on it. Surprisin[章]gtaketheS[来]urprising[自]lyeveryon[知]e had their own balloon soon. Thehe professor[嘛] said to the students:[答] "These balloons is like happiness[案].areWe would never find it if everyone is looking for their own. But if we care about other people,'s happiness[网]llwe'll find our too."ours
