• 2022-05-26
    将F+菌株和F-菌株杂交,Hfr菌株与F-菌株杂交,F’菌株与F-菌株杂交,受体菌F-菌株经过三种杂交后,分别为()菌株
    A: F+,F-,F+
    B: F+,F+,F-
    C: F+,F-,F-
    D: F-,F+,F-