A random mutation occurs in the DNA of individual bacterial cells., The mutation protects the bacterial cell from the effects of the antibiotic - it becomes antibiotic resistant., Bacteria without the mutation die when the antibiotic is present, Antibiotic resistant bacteria survive and can reproduce with less competition from non-resistant bacterial strains., The genes for antibiotic resistance are passed to the offspring., Over time the whole population of bacteria becomes antibiotic resistant because the antibiotic resistant bacteria are best suited to their environment..

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