题目

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∶1和1∶4 答案:AThe words “g_______” and “gym” come from the Greek language, for it was in Greece that Olympic competition started.
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