For a P1 transduction experiment, an E. coli donor strain with the genotype arg+, ser+, ampR and a recipient strain with the genotype arg-, ser-, ampS were used
The following results were obtained for each marker: Of the transductants selected for arginine, 5% are ser+ and 30% are ampR. Of the transductants selected for serine, 3% are arg+ and 0% are ampR. What is the correct order and relative distance of these three genes on the E. coli chromosome?
The order and relative distance is: ampR-arg----ser. Since amp and ser are never cotransduced, they must be very far apart from each other. Arg and ser are rarely cotransduced, so they must be farther apart from each other than are arg and amp, which are more frequently cotransduced, so they must be fairly close together.
You might also like to view...
Replication of DNA
a. takes place during interphase. b. results in two double helices from one. c. is semiconservative. d. is all of the above.
In rivers and streams, the invertebrates that scrape algae off rocks are referred to as shredders
Indicate whether the statement is true or false
Some cells may exit the cell cycle and enter a nondividing G0 state
Indicate whether the statement is true or false
Which of the following is a lactic acid bacterium used in the production of food?
A) Aspergillus oryzae B) Gluconobacter C) Leuconostoc D) Penicillium E) Saccharomyces cerevisiae