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what is one horizontal gene transfer mechanism that if used in a genetics experiment would involve...

what is one horizontal gene transfer mechanism that if used in a genetics experiment would involve many screenings of lots of cells to find successful recombinants that form visible colonies. Explain why you would need to do that many times.

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Horizontal gene transfer is the transfer of foreign gene from one species to another or from same species by mean other than parent to offspring. After transfer cells should be screened for success of transfer. For this genes are transferred by recombinant DNA technology using vector or Direct DNA transfer. Screening may be using marker gene like antibiotic resistant gene or using complimentation test like lacZ alpha blue white screening. By these screenings recombinant ls can be selected.

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