Consider the following hormones and their role in the workings of the endocrine system: Where the hormone is produced. Hormone(s) secreted. Hormone function. Adrenal glands. Aldosterone. Regulates salt, water balance, and blood pressure.
Sometimes there are tissue-specific mutations that control formation of certain tissues and/or organs. For instance, if mutation affects skin then the skin would be wrinkly/ugly but organism would still develop.
Cis-acting control elements (a) Genes of multicellular organisms contain both promoter-proximal elements andenhancers (collectively referred to as cic-acting control elements) in addition to corepromoter element(s).(b) Enhancers function in a distance, position and orientation-independent manner.