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(A) $Selectable marker$ is a gene introduced into a cell, especially a bacterium or to cells in culture, that confers a trait suitable for artificial

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Selectable marker

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(A) $Selectable marker$ is a gene introduced into a cell, especially a bacterium or to cells in culture, that confers a trait suitable for artificial selection.In recombinant $DNA$ technology, it helps in identifying and eliminating non-transformants and selectively permitting the growth of the transformants.Examples include genes encoding resistance to antibiotics such as $ampicillin$, $chloramphenicol$, $tetracycline$, or $kanamycin$.

The gene whose expression helps to identify the transformed cell is known as........

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