Question 2. You have a wild-type strain of E. coli with the genotype A B C D E F You introduce an F+ plasmid into your wild-type strain and isolated a few Hfr derivative strains that you call Hfr1, Hfr2, and Hfr3. You are studying several new genes in E. coli with interesting phenotypes. You obtain a multiply mutant strain with chromosomal genotype: a b c d e f a) You mate each Hfr strain to your multiply-mutant strain in a separate experiment. At various times you interrupt the matings and plate the bacteria under conditions in which only the recipient strain can grow. You obtain the following earliest-time-of-entry data, in minutes: Gene Hfr1 Hfr2 Hfr3 A B D E F - 11 11 13 7 26 - 9 16 5 31 15 27 31 11 Draw a map of these genes that is consistent with the data, including all the genes and Hfr origins, the distances between them (in minutes), and the direction of transfer of each Hfr.

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Question 2. You have a wild-type strain of E. coli with the genotype
A B C D EF
You introduce an F+ plasmid into your wild-type strain and isolated a few Hfr derivative strains that you
call Hfr1, Hfr2, and Hfr3. You are studying several new genes in E. coli with interesting phenotypes. You
obtain a multiply mutant strain with chromosomal genotype:
a b c d e f
a) You mate each Hfr strain to your multiply-mutant strain in a separate experiment. At various times
you interrupt the matings and plate the bacteria under conditions in which only the recipient strain can
grow. You obtain the following earliest-time-of-entry data, in minutes:
Gene Hfr1 Hfr2 Hfr3
A
B
C
D
E
F
11
13
7
I
26 16
11
9
5
31
15 27
31 11
Draw a map of these genes that is consistent with the data, including all the genes and Hfr origins, the
distances between them (in minutes), and the direction of transfer of each Hfr.
Transcribed Image Text:Question 2. You have a wild-type strain of E. coli with the genotype A B C D EF You introduce an F+ plasmid into your wild-type strain and isolated a few Hfr derivative strains that you call Hfr1, Hfr2, and Hfr3. You are studying several new genes in E. coli with interesting phenotypes. You obtain a multiply mutant strain with chromosomal genotype: a b c d e f a) You mate each Hfr strain to your multiply-mutant strain in a separate experiment. At various times you interrupt the matings and plate the bacteria under conditions in which only the recipient strain can grow. You obtain the following earliest-time-of-entry data, in minutes: Gene Hfr1 Hfr2 Hfr3 A B C D E F 11 13 7 I 26 16 11 9 5 31 15 27 31 11 Draw a map of these genes that is consistent with the data, including all the genes and Hfr origins, the distances between them (in minutes), and the direction of transfer of each Hfr.
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