Question

In a gene mapping experiment, DNA from a strain that is gal+ pro+ lac+ is transformed into an E. coli that is gal- pro- lac-. Some resulting transform ants are gal+ lac+ and some are pro+ lac+, but no transform ants are gal+ pro+. Which gene is in the middle?

Answer 1

The lac gene is in the middle based on the results of the experiment.

Step-by-step explanation:

In this gene mapping experiment, the gene that is in the middle is the lac gene. This can be determined from the results of the transformation. Some transformants are gal+ lac+ and some are pro+ lac+, indicating that the lac gene is in the middle. However, no transformants are gal+ pro+, which suggests that the gal gene is not in the middle.