puberty is caused by the release of follicle stimulating hormone and luteinizing hormone from the pituitary gland. these hormones are delivered to the ovary in girls and initiate the monthly release of mature egg cells. this is an example of what mechanism of regulation of gene expression?
Regulation of gene expression is a variety of mechanisms used by cells to increase or decrease specific gene products (proteins or RNA). Sophisticated gene expression systems exist in biology with multiple goals such as stimulating developmental pathways, responding to environmental stimuli or adapting to new food sources. Virtually any stage of gene expression can be controlled, from initiation of translation through RNA processing to post-translational modification. Often one gene regulator controls another, and so on, forming a gene regulatory network.
Genetic regulation is essential for viruses, prokaryotes and eukaryotes because it increases the versatility and adaptability of an organism by allowing the cell to express a protein when needed and inhibiting its production when it is gone. Although Barbara McClintock demonstrated in 1951 an interaction between two activated (Ac) and transposon (Ds) genetic sites to form the color of maize seeds, the first discovery of a genetic regulatory system is the discovery of the lac operator by François Jacob and Jacques Mono in 1961, in which some of the enzymes responsible for lactose metabolism in E. coli except when lactose is present and glucose is absent.