megagametogenesis

Megagametogenesis is the process of forming the female gametophyte, known as the megagametophyte or embryo sac, from a megaspore. This occurs within the ovule of seed plants. A single megaspore mother cell (megasporocyte) undergoes meiosis to produce four megaspores, but typically only one survives and enlarges. This surviving megaspore then develops into the megagametophyte through mitotic divisions. In angiosperms, this typically results in an eight-nucleate embryo sac containing the egg cell, which is essential for sexual reproduction. This process is a crucial part of the plant life cycle, leading to fertilization and the development of a seed.123456