计时电位法

一表现型为紫茎马铃薯叶的番茄与另一表现型为绿茎缺刻叶的番茄杂交,F1全是紫茎缺刻叶,F2中杂合紫茎马铃薯叶植株有3966株,则从理论上分析,F2中杂合紫茎缺刻叶植株有：（ D ）A.17847株 B.7932 帮我写两篇议论文《快与好》 《预约精彩》帮我写两篇议论文《快与好》 《预约精彩》 像议论文就好.写的烂点,我作文么40几分的样子,800个字,如果百度的话 把文章改的烂点~一篇50分 两篇10 求很短但精彩的议论文要4篇,别太短啊,三四百字吧 议论文关于宽容的精彩议论段怎么写 Please tell him _____(not draw) on the wall. 描写秋天景色的四字词语有那些? tell the boy ( )write on the wall.A,not to B,to not C,don't D,not 《变化》（300字）要是兴海学校的变化呀! 非洲的花因为多,所以那里的花开花,草开花,灌木开花,许多树也开花,改病句 非洲的花之所以多,是因为那里的花开花,草开草,灌木开花,许多树也开花.仿写句子 改错：1、Last sunday I was helping my father in his teahouse when a foreign visitor entered in.2、You can never imagine how excited i was when heard the word.第一句要去in,第二句when后要加I这是为什么啊?请详解,\(≧▽≦)/~ picture are the on wall the 怎么连词成句? 还草是什么中药的别名? I draw picture on the wall怎么改为否定句?后面的答案是I picture on the wall.I和picture之间有两个空格! Mike is____(draw)a picture on the wall _________ being late,the students were punished by the teacherA.since B.because C.because of D.for My father came b______ from New York last Monday.Kitty a_______ for penfriends in China last week.1.My father came b______ from New York last Monday.2.Kitty a_______ for penfriends in China last week. 求一段描写秋天的句子! 写一段描写秋天的句子 带有“ck"的英文单词10个以上加翻译, 给几个包含ck的英文单词! 含有ck的单词 含ck 单词几个就够了 这是什么植物,叶子有很浓的香味据说可以用来炖鱼不是,我家有吊兰,叶子没香味,这个有香味,就是我们的炖肉用的香料的味道 有种植物叶子有香味,如图.这种植物学名叫什么,有什么特性? please give China a hug for When I want to cry,please give me a hug的中文意思是什么?请指教 please give me a happy future 非洲的花多.非洲的花开花,草开花,灌木开花,许多树也开花.加关联词 有关于描写秋的诗句,快~~~~~~~~ Please tell me how many students there each of your elass.翻译 1.Please tell me ______.A.how many days are there in a week.1.Please tell me ______.A.how many days are there in a week.B.what novel is thatC.how old you areD.what's your name