How many secondary oocytes are formed form 20 oogonia?

Answer 1

Each oogonium undergoes mitosis to produce primary oocytes, which then enter meiosis. During meiosis, each primary oocyte completes the first meiotic division to form one secondary oocyte and one polar body. However, only the secondary oocyte is viable. Therefore, from 20 oogonia, 20 primary oocytes are formed, leading to the production of 20 secondary oocytes.