You are cloning the genome of a new DNA virus into pUC18. You plate out your transformants on ampicillin plates con- taining X-gal and pick one blue colony and one white colony. When you check the size of the inserts in each plasmid (blue and white), you are surprised to fi nd that the plasmid from the blue colony contains a very small insert of approximately 60 bp, while the plasmid from the white colony does not appear to contain any insert at all. Explain these results.

Biology 2e
2nd Edition
ISBN:9781947172517
Author:Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark
Chapter17: Biotechnology And Genomics
Section: Chapter Questions
Problem 1VCQ: Figure 17.7 You are working in a molecular biology lab and, unbeknownst to you, your lab partner...
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2. You are cloning the genome of a new DNA virus into pUC18.

You plate out your transformants on ampicillin plates con-
taining X-gal and pick one blue colony and one white colony.

When you check the size of the inserts in each plasmid (blue
and white), you are surprised to fi nd that the plasmid from
the blue colony contains a very small insert of approximately
60 bp, while the plasmid from the white colony does not
appear to contain any insert at all. Explain these results.

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