megasporogenesis

[ meg-uh-spawr-uh-jen-uh-sis, -spohr- ]
/ ˌmɛg əˌspɔr əˈdʒɛn ə sɪs, -ˈspoʊr- /

noun Botany.

the formation and development of megaspores.

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Scientific definitions for megasporogenesis

megasporogenesis
[ mĕg′ə-spôr′ə-jĕnĭ-sĭs ]

The formation of megaspores inside the ovules of seed plants. A diploid cell in the ovule, called a megasporocyte or a megaspore mother cell, undergoes meiosis and gives rise to four haploid megaspores. In most plants, only one of the megaspores then goes on to develop into a megagametophyte within the ovule, while the other three disintegrate. In the ovules of angiosperms, megasporogenesis takes place within a structure called a nucellus, and it is the megaspore farthest from the micropyle of the ovary that survives.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.