An Hfr strain that is hisE+ and pheA+ was mixed with a strain that is hisE- and pheA-. The conjugation was interrupted and the percentage of recombinants for each gene was determined by streaking on a medium that lacked either histidine or phenylalanine. The following results were obtained:

A. Determine the map distance (in minutes) between these two genes.
B. In a previous 1experiment, it was found that hisE is 4 minutes away from the gene pabB. PheA was shown to be 17 minutes from this gene. Draw a genetic map describing the locations of all three genes.

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20 hisE t pheA* 0 10 20 30 40 50 Duration of conjugation (minutes)