BIOL 2P93 Lecture Notes - Lecture 36: Stamen, Megaspore, Radicle
24 Jan 2016
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The angiosperms - flower characteristics and life cycle pt 4. Embryo sac (mature megagametophyte): oval structure w/in ovule of angiosperm w/ egg (ovule = egg making structure) having 8 nuclei: 3 at micropylar end (egg + 2 synergids), 3 at chalazal end (antipodals), 2 polar nuclei in centre. Total od 7 cells: 1 large central cell, 3 antipodal cells, 1 egg cell, 2 synergid cells. Ovule w/ 8-nucleate embryo sac migrated to center of sac. Stalk of ovule = funiculus. (mature megagametophyte) (6 nuclei are visible): polar nuclei not yet. Ovule w/ mature is 8-nucleate, 7- chalazal end of synergids) at. Megagametogenesis forming mature megagametophyte /embryo sac: www. youtube. com/watch?v=v0ulwkwsgs0 sac embryo (mature megagametophyte): mature embryo sac cell structure w/ 3 antipodals at ovule, egg apparatus (egg cell + 2 micropylar end + 1 large central cell w/ Soybean life cycle: male anthers: diploid microspore mother cells divide meiotically = 4 haploid microspores (tetrad).
