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If the genes order in bacteria is His gal met. Which of the following genes have the least probability of getting incorporated alone?

If the genes order in bacteria is His gal met. Which of the following genes have the least probability of getting incorporated alone? Correct Answer Gal

Gal can be incorporated alone only by the event of double cross over. Double crossover at such short stretch is of least occurrence so the probability of it being incorporated alone is least.

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