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Colony Growth on Agar Plates

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Genetic experiments often require that numerous individuals be screened for a particular property. Therefore, it helps if large numbers of individuals of the species being studied can be propagated in a small space.

With some types of bacteria, thousands, mill ions, or even bill ions of individuals can be screened on a single agar-containing petri plate. Once on an agar plate, these bacteria divide over and over again, with all the progeny remaining together on the plate until a visible lump, or colony, has formed. Each colony is composed of millions of bacteria, all derived from one original bacterium and hence all clones of the original bacterium.

Snyder and Champness Molecular Genetics of Bacteria

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