To install click the Add extension button. That's it.

The source code for the WIKI 2 extension is being checked by specialists of the Mozilla Foundation, Google, and Apple. You could also do it yourself at any point in time.

Kelly Slayton
Congratulations on this excellent venture… what a great idea!
Alexander Grigorievskiy
I use WIKI 2 every day and almost forgot how the original Wikipedia looks like.
Live Statistics
English Articles
Improved in 24 Hours
Added in 24 Hours
What we do. Every page goes through several hundred of perfecting techniques; in live mode. Quite the same Wikipedia. Just better.


From Wikipedia, the free encyclopedia

Megagametogenesis is the development of a megaspore into an embryo sac, which is the gametophyte - though a highly reduced one - stage in the life cycle of vascular plants.

YouTube Encyclopedic

  • 1/3
    1 536
    118 865
    33 203
  • lesson 23 megagametogenesis medium
  • Biology Of Plants | Learn About Ovule and Gametophyte
  • Morfología de la Flor III - Botánica - Educatina



In eudicot plants, the entire process happens inside the ovule of a plant. The details of the process vary by species, but the process described here is common. This process starts with a single diploid megasporocyte in the nucleus. This megasporocyte undergoes meiotic cell division to form four cells that are haploid. Three cells die and one that is most distant from the micropyle develops into the megaspore. This megaspore becomes larger and the nucleus of it undergoes mitosis three times until there are eight nuclei. These eight nuclei are then arranged into two groups of four. These groups both send a nucleus to the center of the cell which then becomes the polar nuclei. The three cells left at the end of the cell near the micropylar become the egg apparatus with an egg cell in the center and two synergids. A cell wall forms around the other set of nuclei and forms the antipodals. The cells in the center develop into the central cell. This entire structure with its eight nuclei is called the embryo sac.

See also

  • Megaspore - it is the female part of the flower in which seeds are formed. it consists of 7 parts: funicle, hilam, integuments, micropyle, chalaza, nucellus, embryosac
  • Microspore - it is the male part of the flower in which pollen grains are stored.
  • Gametophyte


  • Raven,Peter H., Evert, Ray F., Eichhorn, Susan E.(2005). "Biology of Plants, 7th Edition". W. H. Freeman Chapter 19: 442-449.

This page was last edited on 12 January 2017, at 17:06.
Basis of this page is in Wikipedia. Text is available under the CC BY-SA 3.0 Unported License. Non-text media are available under their specified licenses. Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc. WIKI 2 is an independent company and has no affiliation with Wikimedia Foundation.