B-Galactosidase Permease Genotype No lactose Lactose No lactose Lactose I* P+ O+ Z+ Y+/I P O+ Z+ Y+ a. I- P O Z+ Y-/I P O+ Z- Y b. I* P 0 Z- Y+/I- P+ OC Z+ Y- c. F P O+ Z+ Y-/I+ P O+ Z- Y d. F P+ O+ Z+ Y+/I- P+ O+ Z+ Y+ e. I- P+ OC Z+ Y-/I- P+ O+ Z- Y+ f. I- P O* Z* Y*/I- P+ O° Z+ Y- g. I* P* 0+ Z- Y*/I- P 0 Z Y-
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.
Mutants that are lacY- retain the capacity to synthesize
β-galactosidase. However, even though the lacI gene is
still intact, β-galactosidase can no longer be induced by
adding lactose to the medium. Explain
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