During a complete process of oogenesis from a single primary oocyte, how many ovum and polar bodies are formed?
Oogenesis is a type of gametogenesis (formation of gametes) during which a female gamete (ovum) is produced via multiple divisions.
Primordial germ cells (egg germ cells; 2N) firstly undergo mitosis to form diploid primary oocyte (2N) which on first reductional division forms secondary oocyte (N) and the first polar body.
The first polar body may divide to form two second polar bodies. On further division(meiosis II), secondary oocytes again form a mature ovum and one polar body. Therefore, one ovum and three polar bodies are formed after one oogenesis cycle.