QUESTION 4
A geneticist uses a cloning plasmid that contains the
lacZ gene and a gene that confers resistance to
penicillin. She inserts a piece of foreign DNA into a restriction
site located within the lacZ gene and uses the plasmid to
transform bacteria. She then grows the bacteria on selective media
containing penicillin and X-gal.
Explain how the geneticist can identify bacteria that contain a
plasmid with the foreign DNA.
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Only bacteria with the desired plasmid produce living |
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Bacteria with the desired plasmid produce white colonies. |
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Bacteria with the desired plasmid produce both blue and white |
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Bacteria with the desired plasmid produce blue colonies. |
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