Multiple choice

Four Hfr strains of E. coli were generated from the same F strain. The Hfr strains donated markers in the following order Straini: DQWMT; Strain 2: AXPTM; Strain 3: BNCAX; Strain 4: BDQWM The order of the markers in the original F+ strain is

  1. DQWMTPXACNB

  2. AXPTMDQWBNC

  3. BNCAXPTMDQW

  4. BDQWMNCAXPT
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A Correct answer
Explanation

By overlapping the sequences provided by the four Hfr strains, one can reconstruct the circular order of the markers. Aligning the sequences reveals the circular sequence DQWMTPXACNB.

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