Exam 3 Notes


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Unformatted text preview: id microsporocytes (microsphere mother cells) o Microsporocytes divide by meiosis to produce microspores o Pollen grain becomes the mature male gametophyte The Embryo Sac: The Female Gametophyte o Megasporangium contains megasporocyte (megaspore mother cell) o Megasporocyte undergoes meiosis producing four haploid megaspore (one survives) o Megaspore undergoes 3 mitotic divisions to form the embryo sac 38 Pollination and Fertilization o Pollination occurs when a pollen gran lands on the stigma of a compatible plant o Pollination does not necessarily lead to fertilization Mechanisms Preventing Self Fertilization o Dioecious plants o Flowering morphology – development o Self incompatibility o Plant rejects its own pollen Gametophytic: S­genes are expressed on pollen tube surface Sporophytic: proteins are deposited onto surface of pollen grain by parent plant Double Fertilization o Figrue 38.6 39 From Ovule to Seed o Integuments of ovule develop into seed coat (outer covering of seed) o Triploid endosperm cell divides...
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This note was uploaded on 02/03/2014 for the course BIOL 1202 taught by Professor Gregg during the Spring '08 term at LSU.

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