e. four-base, not overlapping4. An example of a portion of the T4 rIIB gene in whichCrick and Brenner had recombined one + and one −mutation is shown here. (The RNA-like strand of theDNA is shown.)wild type 5′ AAA AGT CCA TCA CTT AAT GCC 3′mutant 5′ AAA GTC CAT CAC TTA ATG GCC 3′a. Where are the + and − mutations in the mutant DNA?b. The double mutant produces wild-type plaques.What alterations in amino acids occurred in thisdouble mutant?c. How can you explain the fact that amino acids aredifferent in the double mutant than in the wild-typesequence, yet the phage has a wild-type phenotype?

Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN:9781305389892
Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Chapter19: Genomes And Proteomes
Section: Chapter Questions
Problem 1ITD: Below is a sequence of 540 bases from a genome. What information would you use to find the...
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e. four-base, not overlapping
4. An example of a portion of the T4 rIIB gene in which
Crick and Brenner had recombined one + and one −
mutation is shown here. (The RNA-like strand of the
DNA is shown.)
wild type 5′ AAA AGT CCA TCA CTT AAT GCC 3′
mutant 5′ AAA GTC CAT CAC TTA ATG GCC 3′
a. Where are the + and − mutations in the mutant DNA?
b. The double mutant produces wild-type plaques.
What alterations in amino acids occurred in this
double mutant?
c. How can you explain the fact that amino acids are
different in the double mutant than in the wild-type
sequence, yet the phage has a wild-type phenotype?

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