题目

There are more girls than boys in that school, with          of the students being girls.    A. three fifth        B. three fifths       C. third five      D. thirds five 答案：B 解析: 略番茄果实的颜色由1对等位基因A，a控制着，下表是关于果实的3个杂交实验及其结果．分析回答：实验组亲本表现型F1的表现型和植株数目  红果黄果一红果×黄果492504二红果×黄果9970三红果×红果1511508（1）番茄的果色中，显性性状是 ，符合杂合子测交的是实验组 ．（2）写出3个实验中两个亲本的基因型组合：实验一 ；实验二 ；实验三 ．