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Leucine (leu), arginine (arg), and methionine (met) are three different amino acids. We expose a competent auxotroph strain of E. coli leu- arg- met- to DNA fragments with wild-type alleles leu+ arg+ met+ for transformation. If two crossovers happen as shown in the figure below during the transformation, what kind of medium can the transformant grow at the end?Medium #1: minimal medium with leucineMedium #2: minimal medium with arginineMedium #3: minimal medium with methionine
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