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 Number of wild-type colonies Genotype of recipient Number of wild-type colonies his- arg+ val+ tyr+ 254 his+ arg- val- tyr+ 132 his+ arg+ val- tyr- 36 his+ arg- val+ tyr+ 240 his- arg- val+ tyr+ 28 his- arg+ val- tyr+ 102 his- arg+ val+ tyr- 100 his+ arg- val+ tyr- 2 What is the cotransduction coefficient of histidine and valine? For consistency, standardize on histidine. 0.38 (wrong) 0.537 0.402 None of these
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 |
Number of wild-type colonies |
Genotype of recipient |
Number of wild-type colonies |
his- arg+ val+ tyr+ |
254 |
his+ arg- val- tyr+ |
132 |
his+ arg+ val- tyr- |
36 |
his+ arg- val+ tyr+ |
240 |
his- arg- val+ tyr+ |
28 |
his- arg+ val- tyr+ |
102 |
his- arg+ val+ tyr- |
100 |
his+ arg- val+ tyr- |
2 |
What is the cotransduction coefficient of histidine and valine? For consistency, standardize on histidine.
0.38 (wrong)
0.537
0.402
None of these
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