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在300株的植物群体中，有7株AA、106株Aa、187株aa，A和a的基因频率是多少如果随机交配，在相同大小的群体中三种基因型植株的数目应是多少

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参考答案：0.2，0.8；12，96，192。

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危害因素是指可能造成人员伤害、职业病、财产损失、作业环境破坏的因素。
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根据中文提示和英文书信内容,写一封意思连贯、符合逻辑、不少于60词的回信。

信的开头和结尾已给出,其字数不计入所完成的回信内)

   假设你叫李明,是美国中学生Tom的笔友。请您根据他给你的电子邮件内容写一封回信。谈谈你喜欢读的书及你对读书这种爱好的看法。

   

Hi Tom,

It's very nice to hear that you like reading a lot.                                                                         

                                                                                                                                                       

                                                                                                                                                       

                                                                                                                                                        

                                                                                                                                                       

                                                                                                                                                       

                                                                                                                                                        

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Yours, 

Li Ming
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