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Lecture_8_Plant_Repro - Concepts and Terms Biology 230...

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4/4/11 1 Biology 230 Jennifer Breckler Plant Reproduction Ch38 (p801-812) Ch39 (p835-840) Campbell 8e Concepts and Terms Angiosperms produce flowers and fruits Fertilization requires pollination (pollen from the anther to the ovary) Most pollinations involve animals, the rest use wind. Pollen dispersal Angiosperms undergo double fertilization After double fertilization, the seed forms (a major site of sugar storage and usage) Seed dispersal Germination of the seed occurs with water uptake Angiosperms produce sexually, asexually or both Fig. 38-1 Animal and plant interaction. Fig. 38-2b Anther Pollen tube Germinated pollen grain ( n ) (male gametophyte) Ovary Ovule Embryo sac ( n ) (female gametophyte) Egg ( n ) Sperm ( n ) Zygote (2 n ) Seed Seed Embryo (2 n ) (sporophyte) Simple fruit Germinating seed Mature sporophyte plant (2 n ) (b) Simplified angiosperm life cycle Key Haploid ( n ) Diploid (2 n ) FERTILIZATION Life cycle of plant: Plants go from diploid to haploid to diploid to .... our arbitrary starting point organism #1 haploid haploid #2 organism formed Fig. 38-2a Stamen Anther Filament Stigma Carpel Style Ovary Receptacle Sepal Petal (a) Structure of an idealized flower Flower structure Fig. 38-3 (a) Development of a male gametophyte (in pollen grain) Microsporangium (pollen sac) Microsporocyte (2 n ) 4 microspores ( n ) Each of 4 microspores ( n ) Male gametophyte Generative cell ( n ) Ovule (b) Development of a female gametophyte (embryo sac) Megasporangium (2 n ) Megasporocyte (2 n ) Integuments (2 n ) Micropyle MEIOSIS Surviving megaspore ( n )
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