Inducer (lactose) Inducer (lactose) absent present B- B- Genotype Permease Permease Galactosidase Galactosidase lacI* lacP* a. laco* lacZ* lacY lacI* lacP* b. lacO lacz* lacY lacI lacP* c. lacO lacz+ lacY lacI lacP* laco* lacZ* lacY*/ d. lacI* lacP laco* lacz* lacY lacI lacP* lacO lacz e. lacY /lacI* lacP* lacO* lacz* lacY* lacI* lacP lacO lacz* f. lacY /lacl lacP* laco* lacZ lacY
Gene Interactions
When the expression of a single trait is influenced by two or more different non-allelic genes, it is termed as genetic interaction. According to Mendel's law of inheritance, each gene functions in its own way and does not depend on the function of another gene, i.e., a single gene controls each of seven characteristics considered, but the complex contribution of many different genes determine many traits of an organism.
Gene Expression
Gene expression is a process by which the instructions present in deoxyribonucleic acid (DNA) are converted into useful molecules such as proteins, and functional messenger ribonucleic (mRNA) molecules in the case of non-protein-coding genes.
A strain of E. coli has the genotypes shown below at the lac operon, where I = regulator gene, P = promoter, O = operator, Z = βgalactosidase gene, and Y = permease gene. The superscript+ indicates a wild-type allele,c indicates a constitutive mutation, and− indicates a defective mutation. For each genotype, indicate whether the enzyme will be synthesized or not synthesized when lactose is present or absent by placing a + for synthesis occurring and a − for synthesis not occurring in the appropriate blank. Explain your reasoning for each answer.
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