Bio Phe Cys Thr Leu Thi Bio Phe Cys Thr Leu Th 为何采用多重营养缺陷型菌株? Mixture 尽可能地排除 回复突变对实验结果的干扰! 中间平板上长出的原养型菌落是两菌株 之间发生了遗传交换和重组所致! Bio Phe'oys' Thr Leu’Th Prototrophic colonies Figure 14.12 Evidence for Bacterial Conjugation. Lederberg and Tatums demonstration of genetic recombination using triple auxotrophs. See text for details中间平板上长出的原养型菌落是两菌株 之间发生了遗传交换和重组所致！ 为何采用多重营养缺陷型菌株？ 尽可能地排除 回复突变对实验结果的干扰！ 8