Biology · Genetics
A partial diploid heterozygote of E. coli was produced with the following genotype: trpR+ trpO- trpE+ / trpR+ trpO+ trpE+, where R is the repressor, O is the operator, and trpE encodes the first enzyme in the tryptophan biosynthetic pathway. Assuming all other required enzymes are wild type, what is the most likely phenotype of this E. coli strain?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Cannot synthesize tryptophan under any condition
- 2Synthesizes tryptophan only when tryptophan is present in the medium
- 3Synthesizes tryptophan only when tryptophan is absent from the medium
- 4Synthesizes tryptophan constitutively (irrespective of tryptophan status in the medium)✓
Correct answer
Synthesizes tryptophan constitutively (irrespective of tryptophan status in the medium)
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