In E. coli, the genes for histidine (his), arginine (arg), tyrosine (tyr), and valine (val) synthesis are closely linked. A wild-type strain is used as a donor for transducing viruses. Various recipient strains were treated with these viruses. Wild-type recombinant colonies were then counted, with the results shown in the following table. Genotype of recipient his- arg+ val+ tyr+ his+ arg+ val- tyr- his- arg- val+ tyr+ his- arg+ val+ tyr- Number of wild- type colonies 254 his arg val tyr arg val his tyr val tyr his arg arg his val tyr None of these 36 28 100 What is the order of these four loci? Genotype of recipient his+ arg- val- tyr+ his+ arg- val+ tyr+ his- arg+ val- tyr+ his+ arg- val+ tyr- Number of wild- type colonies 132 240 102 2
In E. coli, the genes for histidine (his), arginine (arg), tyrosine (tyr), and valine (val) synthesis are closely linked. A wild-type strain is used as a donor for transducing viruses. Various recipient strains were treated with these viruses. Wild-type recombinant colonies were then counted, with the results shown in the following table. Genotype of recipient his- arg+ val+ tyr+ his+ arg+ val- tyr- his- arg- val+ tyr+ his- arg+ val+ tyr- Number of wild- type colonies 254 his arg val tyr arg val his tyr val tyr his arg arg his val tyr None of these 36 28 100 What is the order of these four loci? Genotype of recipient his+ arg- val- tyr+ his+ arg- val+ tyr+ his- arg+ val- tyr+ his+ arg- val+ tyr- Number of wild- type colonies 132 240 102 2
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Genetic Recombination
Recombination is crucial to this process because it allows genes to be reassorted into diverse combinations. Genetic recombination is the process of combining genetic components from two different origins into a single unit. In prokaryotes, genetic recombination takes place by the unilateral transfer of deoxyribonucleic acid. It includes transduction, transformation, and conjugation. The genetic exchange occurring between homologous deoxyribonucleic acid sequences (DNA) from two different sources is termed general recombination. For this to happen, an identical sequence of the two recombining molecules is required. The process of genetic exchange which occurs in eukaryotes during sexual reproduction such as meiosis is an example of this type of genetic recombination.
Microbial Genetics
Genes are the functional units of heredity. They transfer characteristic information from parents to the offspring.
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Second, Question 3
Transcribed Image Text:In E. coli, the genes for histidine (his), arginine (arg), tyrosine (tyr), and valine (val)
synthesis are closely linked. A wild-type strain is used as a donor for transducing
viruses. Various recipient strains were treated with these viruses. Wild-type
recombinant colonies were then counted, with the results shown in the following
table.
Genotype of
recipient
his- arg+ val+
tyr+
his+ arg+ val-
tyr-
his- arg- val+
tyr+
his- arg+
val+ tyr-
Number of wild-
type colonies
254
his arg val tyr
arg val his tyr
val tyr his arg
arg his val tyr
None of these
36
28
100
What is the order of these four loci?
Genotype of
recipient
his+ arg- val-
tyr+
his+ arg- val+
tyr+
his- arg+ val-
tyr+
his+ arg- val+
tyr-
Number of wild-
type colonies
132
240
102
2
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