311DCh38 - Ch 38 pg 801-811 817-818 Diploid...

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Ch. 38 pg. 801-811 & 817-818; Diploid plant (sporophyte) -> Haploid spores via meiosis -> Gametophytes (sperm and eggs) via mitosis -> Diploid zygote via fertilization -> Sporophyte via mitosis -> Flowers are determinate shoots, meaning that they cease growing after the flower and fruit are formed Floral organs – sepals, petals, stamens, and carpels – are attached to a part of the stem called the receptacle Stamens and carpels are reproductive organs Sepals and petals are sterile Stamens consist of a stalk called the filament and terminal structure called the anther; within anther are pollen sacs, where pollen is produced Carpel – ovary at its base and a long slender, neck called the style; tip of style is a sticky structure called the stigma that serves as a platform for receiving pollen; within ovary one or more ovules Pistil – refers to a single carpel or a group of fused carpels Inside microsporangia (pollen sacs in the anther) diploid cells called microsporocytes undergo meiosis forming four haploid microspores; each microspore can give rise to a haploid male gametophyte; each microspore develops into a pollen grain; when a pollen grain lands on the stigma of a carpel the pollen tube begins to grow into a mature male gametophyte when its nucleus divides and forms two sperm
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One or more ovules contain megasporangium inside the ovary; one cell in the megasporangium in each ovule grows and goes through meiosis; produces four haploid
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This note was uploaded on 02/01/2011 for the course BIO 311D taught by Professor Reichler during the Spring '08 term at University of Texas.

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311DCh38 - Ch 38 pg 801-811 817-818 Diploid...

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