2012届高三生物必修一模块检测10选择题 LISTNUM Default l 3 (2010·山东理综7)蚕豆根尖细胞在含3H标记的胸腺嘧啶脱氧核苷培养基中完成一个细胞周期然后在不含放射性标记的培养基中继续分裂至中期其染色体的放射性标记分布情况是 (
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