Bacteriophage P22 was used in generalised transduction experiments to infect the Salmonella typhimurium donor strains described in the table below. The resulting phage lysates were then used to infect the recipient strains of S. typhimurium recipient strains listed in the table. In each cross, a phenotype was selected for one of the selected for one of the three genetic markers studied (str, aceA, thrA), and were made to select the recombinants corresponding to the other two markers. markers. The results are given in the following table: I. Strain I donor str thrA aceA thrA str aceA+ Strain recipient strs thrA+ aceA thrA straceA Phenotype selected Str Ace+ Str recombinants selected ThrA ThrA ThrA ThrA Ace Ace Number 60 40 95 5 10 90 str: gene involved in streptomycin resistance, aceA: gene involved in the use of acetate as a carbon source, thrA: gene involved in threonine biosynthesis. 1) What are the selective media used in these three transduction experiments? to obtain the selected phenotypes and to obtain the selected recombinants? 2) Determine the order of the genes and draw a genetic map showing this order

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Bacteriophage P22 was used in generalised transduction experiments to infect the Salmonella
typhimurium donor strains described in the table below.
The resulting phage lysates were then used to infect the recipient strains of S. typhimurium
recipient strains listed in the table.
In each cross, a phenotype was selected for one of the selected for one of the three genetic
markers studied (str, aceA, thrA), and were made to select the recombinants corresponding to the
other two markers. markers.
The results are given in the following table:
Strain
I donor
str thrA
aceA thrA
str aceA+
Strain
recipient
strs thrA+
aceA thrA
str aceA
Phenotype
selected
Str
Ace+
Str
recombinants
selected
ThrA
ThrA
ThrA
ThrA
Ace
Ace
Number
60
40
95
5
10
90
str: gene involved in streptomycin resistance,
aceA: gene involved in the use of acetate as a carbon source,
thrA: gene involved in threonine biosynthesis.
1) What are the selective media used in these three transduction experiments? to obtain the
selected phenotypes and to obtain the selected recombinants?
2) Determine the order of the genes and draw a genetic map showing this order
Transcribed Image Text:Bacteriophage P22 was used in generalised transduction experiments to infect the Salmonella typhimurium donor strains described in the table below. The resulting phage lysates were then used to infect the recipient strains of S. typhimurium recipient strains listed in the table. In each cross, a phenotype was selected for one of the selected for one of the three genetic markers studied (str, aceA, thrA), and were made to select the recombinants corresponding to the other two markers. markers. The results are given in the following table: Strain I donor str thrA aceA thrA str aceA+ Strain recipient strs thrA+ aceA thrA str aceA Phenotype selected Str Ace+ Str recombinants selected ThrA ThrA ThrA ThrA Ace Ace Number 60 40 95 5 10 90 str: gene involved in streptomycin resistance, aceA: gene involved in the use of acetate as a carbon source, thrA: gene involved in threonine biosynthesis. 1) What are the selective media used in these three transduction experiments? to obtain the selected phenotypes and to obtain the selected recombinants? 2) Determine the order of the genes and draw a genetic map showing this order
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