I have done an electrophoresis of white colonies from blue white screening. Why are there non-recombinant plasmids bands?

I have done a blue-white screening with E.coli and pUC19 with lambda DNA. Then, I selected some white colonies (and blue colonies as a control) and gel electrophoresed them next to pure pUC19. All...

14 November 2022 401 3 View