When foreign text{DNA} is inserted into any v | vedclass

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(D) The insertion of foreign $	ext{DNA}$ into a vector often occurs at a site within a selectable marker gene (e.g.,antibiotic resistance genes like

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Recombinant cells

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(D) The insertion of foreign $	ext{DNA}$ into a vector often occurs at a site within a selectable marker gene (e.g.,antibiotic resistance genes like $amp^R$ or $tet^R$).This process leads to the disruption or inactivation of the marker gene,a phenomenon known as insertional inactivation.By comparing the growth of colonies on media containing different antibiotics,researchers can distinguish between cells that have taken up the recombinant vector (recombinant cells) and those that have taken up the non-recombinant vector (non-recombinant cells).Therefore,insertional inactivation is a crucial technique used for the selection of recombinant cells.

When foreign $\text{DNA}$ is inserted into any vector,it results in inactivation of any marker gene. This is used for the selection of $........$ ?

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