單項選擇題將F+菌株和F-菌株雜交,Hfr菌株與F-菌株雜交,F’菌株與F-菌株雜交,受體菌F-菌株經過三種雜交后,分別為()菌株

A.F+,F-,F+
B.F+,F+,F-
C.F+,F-,F-
D.F-,F+,F-


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