2022智慧上进六答案

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39(10分,除标注外,每空1分)(1)一二三二(3)取T637的细胞做成装片,在显微镜下观察染色体的形态和数目(3分)基因突变显性【解析】(1)若某种自花受粉植物的AA和aa植株分别发生隐性突变和显性突变,在子一代都出现Aa,最早子一代中观察到显性突变,在子二代中观察到隐性突变;最早在子三代能分离得到显性纯合子,在子二代能分离得到隐性突变的纯合子(2)基因型为YyOR的植株与基因型为yyOx的植株杂交,子一代中Yy:yy=1:1,OR:Or:Rr:OO1:1:1:1,其中OO不能存活,故子一代存活植株中紫秆稀裂叶的比例是1/2紫秆(yy)×2/3稀裂叶:(OR+Rr)=1/3(3)欲证明“T637”发生的变异是基因突变而不是染色体变异,最简单的方法是取“637”的细胞做成装片,在显微镜下观察染色体的形态和数目,若突变体只有一条4号染色体的L基因中有一段序列插入,则可确定此种变异类型为基因突变,且为显性突变。

One summer day last year, I went to the beach withseveral friends. As they are relaxing on the sand, Iwere上文的" One summer day last vear"表明此处陈逃发生在过去的事情,应用一般过去时went for a walk along the beach. Deeply in thought, Ideep in thought表示”陷入深思”,为园定用法。dep"澴深地,在深处just kept on walking ahead. Suddenly, there came thesong of a seagull. My mind pulling out, I noticed that此处考查独立主格结构,pull与mind之间是逻辑上的动宾关系,应用过去分词I had gone so further away. I then headed back for my语境中没有比较的含义,应用副词原级friends, and they were nowhere in sight- people had前后分句之间是转折关系,应用bubeen crowded the beach. With my cellphone in handWithout下文的" turn to a strangerpeople与 crowd之间是主动关系,应用主动语态 earby”表明作者没有带手机,故应用 WithouI had no choice but A turn to a stranger nearbyhave no choice but to do sth."不得不做某事”,是国定搭配She helped me get in contacts with my friendcontactontact在此表示”联系”,是不可数名词。 get in contact withsb."与某人取得联系and find them. I was really grateful for their kindness andher此处指作者非常感激那位陌生女士的善意和帮助,应用herhelp