[DIYbio] Culturing antibiotic resistant bacteria on regular media?

I have a very basic question as a beginning bio student: What would happen if you sub-cultured something like E. coli with a ampicillin resistant plasmid that's currently growing on amp LB onto plain LB?

My hypothesis based on my limited experience is that assuming no contamination, it will grow but so will E. coli lacking the amp resistance. But why? Do mutations occur in asexual reproduction for the sake of genetic diversity?

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