Mutants 2 5 and 6 were interbred to produce diploid f1, Ask an Expert

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Mutants 2, 5, and 6 were interbred to produce diploid F1 hybrids. Some of the resulting diploids could grow on cysteine; others could not (see table). What does this reveal about the mutations in strains 2, 5, and 6 and about the minimum number of genes needed for biosynthesis of methionine?

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