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.
This research has identified the fundamental properties of how cells grow and divide, how inheritance works, and how organisms store and use energy. By studying model organisms, scientists are learning more about how the brain functions and what drives behaviors like eating, sleeping, sex and even aggression. This foundation of knowledge has led to new methods for maintaining health and for diagnosing and treating disease in humans.