问题 填空题 案例分析题

红眼长翅的雌果蝇与红眼长翅的雄果蝇交配,后代的表现型及比例如下表:

若对雌性亲本测交,所得后代雌雄的比例为()

答案

参考答案:1∶1

改错题

Anne lives in a small town.She is fond of

surfing the Internet.In general speaking,she                                                   1.       

spent about an hour a day on line.To her,it is                                                        2.       

a wonderful place because you never know that                                            3.       

it may have in store for you.Last Friday,she                                                         4.       

found an e-pal,that called himself “Future”.                                                         5.       

They promised to keep touch with each other.                                               6.       

And she was warned against him by her parents.                                                  7.       

“What will it lead to?” she asked.“A happy ending,”                                      8.       

Anne answered and continued typing,paid no                                                9.       

attention to them.One month past,and a man                                                        10.       

called “Future” was arrested by the police!

单项选择题