题目

研究表明:一对黑色家鼠与白化家鼠杂交,F1均为黑色家鼠,F1中黑色家鼠个体自由交配,F2出现黑色家鼠:浅黄色家鼠:白化家鼠=9:3:4,则F2中浅黄色个体中能稳定遗传的个体比例为(    ) A.1/16               B.3/16             C.1/3                 D.1/4 答案:C27、— What    disappointment to see Liu Xiang quit his game in      29th Beijing Olympic Games! 一But I still support him.After all,he is in poor health. A.不填;the          B.a;the           C.the;不填            D.the;the 评卷人 得分 三、阅读理解 (每空? 分,共? 分)
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