Angiosperm Life Cycle Fall 2011

Angiosperm Life Cycle Fall 2011 - Angiosperm Life Cycle...

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Unformatted text preview: Angiosperm Life Cycle Life Cycle of Angiosperms mega- and microgametophytes mitosis mega- and microspores gametes (egg, sperm) meiosis fertilization mega- and microsporocytes zygote mitosis mega- and microsporangia embryo sporophyte n 2n No gametangia!!! Fig. 30-10-4 MEIOSIS Key Microsporangium Microsporocytes (2 n ) Generative cell Anther Tube cell Pollen grains Microspore ( n ) Male gametophyte (in pollen grain) ( n ) Mature flower on sporophyte plant (2 n ) Haploid ( n ) Diploid (2 n ) MEIOSIS Ovule (2 n ) Ovary Megasporangium (2 n ) Megaspore ( n ) Female gametophyte (embryo sac) Antipodal cells Central cell Synergids Egg ( n ) Pollen tube Pollen tube Stigma Sperm ( n ) Discharged sperm nuclei ( n ) FERTILIZATION Germinating seed Embryo (2 n ) Endosperm (3 n ) Seed coat (2 n ) Seed Nucleus of developing endosperm (3 n ) Zygote (2 n ) Egg nucleus ( n ) Style Sperm In Chapter 30 Fig. 38-2b Anther Pollen tube Germinated pollen grain ( n ) (male gametophyte) Ovary Ovule Embryo sac ( n...
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Angiosperm Life Cycle Fall 2011 - Angiosperm Life Cycle...

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