Читать книгу Snyder and Champness Molecular Genetics of Bacteria - Tina M. Henkin - Страница 24

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.