The phenomenon where a single gene influences multiple phenotypic traits is called: MCQ with Answer and Explanation

Explanation:
Joseph Priestley discovered oxygen, Lavoisier named it and explained combustion and respiration, Ingenhousz showed plants produce oxygen in light. Together, their work elucidated the oxygen cycle. So all contributed.

Explanation:
Galanin is a 29-amino acid neuropeptide that is co-localized with several other neurotransmitters and hormones. In the central nervous system, it is involved in various functions, including the inhibition of acetylcholine release and modulation of pain. In the gastrointestinal tract and pancreas, its primary functions are inhibitory: it inhibits the release of both insulin and glucagon from the pancreatic islets, inhibits gastric emptying and gastric acid secretion, and generally inhibits intestinal motility and secretion. It acts to slow down digestion and nutrient absorption.

Explanation:
Centrioles are cylindrical microtubular structures found near the nucleus in animal cells, forming the centrosome. They organize spindle fibers during cell division (mitosis and meiosis) and are also the basal bodies of cilia and flagella. They are absent in higher plant cells. Centrioles duplicate during S phase and migrate to poles during prophase.