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ashref ashref
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9 years ago
In yeast strain S288C (standard wild type) the spontaneous forward mutation frequency from tryptophan prototrophy (Trp+) to auxotrophy (Trp-) is 5 × 10^-7. For the tryptophan 5 gene (TRP5) the forward mutation frequency is 3 × 10^-8. Explain the difference between the two mutation frequencies.

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