The operator of the lac operon is upstream of the gene that codes for enzymes. What does upstream mean in this context? a) The operator is crossed by RNA polymerase before RNA polymerase crosses the promoter. Ob) The operator is separated from the lacZ gene by thousands of bases. c) The operator is in the first part of the lacZ gene. d) The operator is crossed by RNA polymerase before RNA polymerase reaches the gene which codes for enzymes.

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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.