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32.(12分)(1)能(1分)实验②中F2的表现型比例为9：3：3：1(2分)(2)Aabb(2分)AAbb(2分)(3)1/2(2分)》(4)A/a和B/b基因位于一对同源染色体上，且A与b基因在一条染色体上，a与B基因在一条染色体上(3分)【考查点】本题考查自由组合定律的应用。【解析】(1)由表格分析可知，实验②中F,的表现型比例为9：3：3：1，说明控制这2对相对性状的基因独立遗传，且马铃薯叶和紫茎为显性性状。(2)由(1)分析可知，实验②中F,马铃薯叶紫茎的基因型为AaBb,则亲本丙和丁均为纯合子，因丙种植后均表现为马铃薯叶绿茎，故丙的基因型为AAbb,丁的基因型为aaBB;实验①中F,表现型比例为1：1：1：1，即(1：1)(1：1)，甲种植后均表现为马铃薯叶绿茎，则甲的基因型为Aabb,乙的基因型为aaBb。(3)若乙与丙杂交，即aaBb×AAbb,后代马铃薯叶绿茎个体(Aabb)所占比例为1×1/2=l/2。(4)若实验②中F,的表现型及比例为马铃薯叶紫茎：马铃薯叶绿茎：缺刻叶紫茎=2：1：1，即没有缺刻叶绿茎个体(aabb),说明控制2对相对性状的基因不能自由组合，即AVa和B/b基因位于一对同源染色体上，且F,不能产生基因型为b的配子，又因F,的基因型为AaBb,则F,中A与b基因在一条染色体上，a与B基因在一条染色体上。
第二节（满分25分）Paragraph 1:As John was farther from the snake,he jumped to the window and grabbed thecurtain.He pulled it so hard that the curtain was torn off immediately.Without hesitation,he threw the curtain at the moving snake and covered it.Then he grabbed the twoextremely frightened kids'arms and pushed them out of the room.The moment the kidswent out,they started screaming.John went inside the room again and brought his momout,who was standing still,frozen with fear.Soon after that,he shut the door and calledthe rescue team.Paragraph 2:After the rescue team caught and took away the snake,everyone went inside thehome.Seeing the two kids were still scared,John felt guilty and even angry with himself.He went up to the kids,patting them on the head and said,"I'm sorry.I mistook it for afake one."After a short pause,he asked in an excited voice,"Shall we play some gametogether now?"The kids burst into a smile."What a thrilling day!"John texted his friendlater that day.【解析】本文以人物为线索展开，讲述了约翰在沙发底下找遥控器时，抓到了一条蛇，一开始以为是假蛇，结果蛇动了起来，妈妈和另外两个孩子也吓坏了。幸亏最后约翰冷静机智地处理了蛇，从房间里把妈妈抱了出来，叫来了救援队，化解了危机。【详解】1.段落续写：①由第一段首句内容“由于约翰离蛇远一些，他跳上窗户，抓住了窗帘。”可知，第一段可描写约翰是如何处理蛇的，他用帘子盖住了蛇，把两个孩子和妈妈带出了房间。②由第二段首句内容“在救援队抓住并带走那条蛇后，每个人都进屋去了。”可知，第二段可描写蛇被处理后，约翰对孩子说的话。2续与线索：抓住窗帘一盖住蛇—把孩子推出房间—把妈妈抱出房间救援队赶到一安慰孩子3.词汇激活行为类关闭：shut/close走进：go inside/get into看见：see/spot情绪类害怕的：frightened/scared/fearful生气的：angy/mad【点睛】[高分句型l]He pulled it so hard that the curtain was torn off immediately.(运用了结果状语从句)[高分句型2]John went inside the room again and brought his mom out,.who wasstanding still,.frozen with fear.(运用了who引导非限制性定语从句)
