OR3 OR2 ORI Рам Pa During the lysogenic cycle, the a repressor controls the switch. During the lytic cycle, the cro protein controls the switch. cro proteln binds to Oga- The a repressor binds to OR FA repressor cro proteln OR OR3 On2 PR ORI Og3 Or2 PR PaM Off The A repressor binds to Orz and then to Og3 cro proteln binds to OR2 and Our OR3 OR2 ORI Ora Orz ORI PeM The amount of the a repressor falls, because cll Is not activating P The a repressor Is released from Og3- Lytic cycle occurs Рам FIGURE 18.11 The Og operator, the genetic switch bet ween the lysogen ic and lytic cycles. Lysogenic cycle occurs CONCEPT CHECK: What environmental conditions favor a switch to the lytic cycl in in

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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.