Answer:
Gene regulation plays a significant role in healthy development. In order to make a brain cell behave and look differently from a liver cell or a muscle cell throughout development, genes are turned on and off in various patterns.
A gene that is disabled stops giving instructions for producing proteins. This implies that the proteins required to do a specific task, like tolerating lactase, aren't created.
A certain gene performs a specific job, and if the gene is constantly on, the body cannot turn or regulate the functions, which can lead to a variety of health issues and have an impact on the body. Hence, it is necessary for the cell to have the ability to turn the gene off.
This indicates that only a few number of genes are active (switched "on" at a time) in any cell. What a cell can do—its function—is determined by the genes that are "on." While some genes are active exclusively in particular cell types or body parts, others are only active in certain types of cells.