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我美丽因为我自信开头 两对相对性状的基因自由组合,如果F2的分离比分别为9：7、9:6:1和15:1,那么F1与双隐性个体测交.得到的分离比为?答案给的是1:3,1:2:1和3:1,但我不知道是怎么来的.还有就是 怎么算当然就不清楚了 我美丽因为我自信心的事例 两对相对性状遗传因子自由组合,若F2分离比分别为9：7、9：6：1和15：1,那F1与双隐性个体测交,所得的分离比分别是?A】1：3、1：2：1和3：1 B】3：1、4：1和1：3 C】1：2：1、4：1和3：1 D】3：1、3 return home还是come home两个有什么区别,还有arive home baby come home I know,I was trying to tell you that I was coming. Tell you when you need to know that.这是一句英语、. 在同一对染色体上的非等位基因在形成配子时可自由组合吗?(在四分体中会发生交叉互换.) 具有两对或多对相对性状的亲本杂交,f1产生的配子时,一对等位基因与另一对等位基因的分离或组合是互干 ---I want to have my hair cut,but I can't find a barber shop.－Excuse me,I want to have my hair cut,but I can't find a barber shop． －I know where _______ is.Come on,I'll show you.　　A.there B.it C.the one D.one They are working in the garen 对画线部分提问 画线的是are working They are looking FOR BAG.(对画线部分提问）for bag 是画线部分 They are my friends.（就画线部分提问） 关于few,little,much,many.请问它们分别的比较级和最高级是什么?求比较级和最高级.谢谢. I ____have my hair cut tomorrow I sometimes have a picnic with my family____the weekI live __Beijing.He lives in___Hainan Island. 江水 郦道元 江水又东径黄牛山下有滩名曰黄牛滩 加上标点 文言文从“江水又东,径狼尾滩……”与“江水又东,径黄牛山……”在内容和写法上快啊,一分钟之内!及有什么区别 They are （working hard）就括号部分提问 They are climbing trees.对括号部分提问括号部分：climbing trees They are 【sad】,对括号部分提问 They are （foxes）.括号里提问 Boys didn't know if there____(be) an English party that day was 还是 would be The problem was that he didn't know what would hurt her and he didn’t ___ ask her.Adare Bdare to 否定句中to不是可以省略吗,为什么不选A my hair is too long.im going to have it cut.为什么这里要用cut?而不是用cuts? They are talking now.(对talking提问) they are talking about (the picture)对括号部分提问 They are talking now的提问形式 They are talking to （their teacher） 对括号部分提问_____ are they talking _____? they are talking about the weathe 对划线部分提问the weather 英语翻译 言水路纡深,回望如一矣． 翻译!