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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 sele

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help in eliminating the non-transformants,so that the transformants can be regenerated

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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,selectable markers (such as antibiotic resistance genes) are used to identify and eliminate non-transformants (cells that have not taken up the recombinant $DNA$) and selectively permit the growth of transformants (cells that have successfully taken up the recombinant $DNA$). This ensures that only the desired transformed cells are regenerated or cultured.

$A$ selectable marker is used to

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