L67-07 Angiosperm Life Cycle - BIO 102/104 2007 March 28,...

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1 BIO 102/104 2007 March 28, Lecture 67, Title: Angiosperm life cycle Text Readings: Campbell and Reece (2005), Pgs. 598-606. For those who wish more background I suggest the following text pages: Pgs. 242-243: For a review of life cycles. Pgs. 573-579: To learn how Angiosperms are related to other plant groups. Pgs. 591-593: For more on heterospory and other traits found in seed plants. Pgs. 771-780: For more information on flower structures, pollination, reproductive processes, and early embryo and seedling growth. Topics to cover: Angiosperm Strategy Homosporous Life Cycle to Heterosporous Life Cycle Sporophyte Flower Structures and Sporangia Meiosis and Spore Production Ovule and Female Gametophyte Development Anther Sac and Male Gametophyte Development Pollen and Pollination Double Fertilization makes Zygote and Endosperm Growth of Endosperm and Sporophytic Embryo Seeds and Fruits If Time: Slide Show Angiosperm Strategy Gymnosperms and angiosperms are current living seeded plants. .. were others in the past Unlike pines, angiosperms often use animals for pollination and dispersion so need to interact well with animals. .. play with their minds Why should pre-meds study plants? Plant's experiments in plant/animal interactions drugs, poisons, perfumes and foods to attract pollinators, repel herbivores Therefore plants are a source of drugs: ethnobotany, clinical work, etc. .. Use of plants to make other items. Genetically modified crops. .. Homosporous Life Cycle to Heterosporous Life Cycle Review homosporous life cycle; build it into the animal life cycle. .. Homosporous, one type of sporangium, makes spore of one size in a sporangium spore (1N), does mitosis to become gametophyte gametophyte, via mitosis makes archegonium + antheridium, to make gametes gametes (1N), egg and sperm, do fertilization to make a zygote zygote (2N), via mitosis will become a sporophyte sporophyte (2N), multicellular, in sporangia do meiosis and make spores
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2 contrast to heterosporous gymnosperm and angiosperm (flowering plant) life cycle Heterosporous, two types of sporangia, makes spores of two distinct sizes microsporangium, in which through meiosis makes microspores megasporangium, in which through meiosis makes megaspores sporophyte (2N), is the generation that has sporangia and does meiosis spores (1N), two types each will do mitosis, male gametophyte (1N), microgametophyte, does mitosis to make sperm female gametophyte (1N), megagametophyte, does mitosis to make egg male and female gametophytes (microgamteophyte and megagametophyte) in angiosperms the gametophytes are so reduced to so few cells that can not form complete archegonia and antheridia, but still make gametes gametes (1N), egg and sperm meet to do fertilization to make a zygote
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This note was uploaded on 05/18/2008 for the course BIO G 104 taught by Professor Chen,k.c during the Spring '06 term at Cornell University (Engineering School).

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L67-07 Angiosperm Life Cycle - BIO 102/104 2007 March 28,...

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