title: Expression of the tryptophan operon in merodiploids of Escherichia coli. I. Gene dosage, gene position and marker effects.
mesh_terms: D004171:Diploidy; D004794:Enzyme Repression; D004926:Escherichia coli / Q000166:cytology*; D006238:Haploidy; D006720:Homozygote; D006836:Hydro-Lyases; D008967:Molecular Biology; D009876:Operon; D014364:Tryptophan / Q000378:metabolism*
chemical_list: D014364:Tryptophan; D006836:Hydro-Lyases