Insertional inactivation using Lac Z gene (Blue white screening) | Biotechnology | Khan Academy

In this video, let's explore how we can use an enzyme producing selectable marker to select for the right cells. We will take the example of Lac Z gene, which naturally digests Beta galactosidase, and see how using X-gal, we can screen for the recombinants. This method takes less steps than using multiple antibiotic markers, is quicker, and therefore more suited.
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Created by Khadijatul Qubra

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my professor out of NOWHERE told us to see what lacz does in gene cloning etc over the weekend as on monday we have our viva.
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Is this process useful for E.coli? as all E.coli cell recombinant or not or non transformant have lac z gene on genomic DNA.

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