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Unformatted text preview: The other crosses that caused a mutant to be able to produce the pigment were: 1x2, 1x3, 1x5, 2x3, 2x4, 3x4 and mine, which was 4x5. In the 1x2, 1x3 and 1x5 crosses the #1 strain is the mutant, which is cross-fed causing it to produce the pink pigment (it would normally be white). Since the #1 mutant can be fed by mutants 2, 3 and 5 this means that #1s mutation is earlier in the pathway. In the 2x4, 3x4 and 4x5 crosses, the #4 mutant (which is normally white) was able to produce the pink pigment. This means that #4 also has a mutation earlier in the pathway than the mutations that occur in 2, 3, and 5. The 2x3 cross is different in that the mutant, #3, which is cross-fed is normally peach (instead of white) meaning it can produce the nonprodigiosin pigment....
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- Spring '08