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: The Unity and Diversity of Life (MindTap Course List)
15th Edition
ISBN:9781337408332
Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Chapter15: Studying And Manipulating Genomes
Section: Chapter Questions
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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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