Chapter_25-_Plant_Reproduction - Chapter 25 BIO 1002...

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Chapter 25 BIO 1002 2/12/2008 Chapter 25: Plant Reproduction and Development I. Asexual Reproduction - By fragmentation, either naturally (runners) or artificial (clippings) II. Sexual Reproduction - Combines genes from 2 different parents, offspring genetically different A. Alteration of Generations: -Diploid sporophyte meiosis haploid spore haploid gametophyte mitosis haploid gamete fertilization diploid sporophyte -Mosses/ ferns: gametophyte small and independent, water essential to sexual reproduction -* Gymnosperms/angiosperms: sporophyte large, water no longer needed -Seed plants have 2 types of spores: 1. Megaspores: - give rise to female gametophyte (haploid) - an embryo sac containing an egg cell 2. Microspores: - give rise to male gametophyte: pollen grains (sperm) III. Evolution of Flowers A. a) Gymnosperms (earliest seed plants) - Wind pollination used for fertilization - Ex: male pine cones (don’t need any biological help); disadvantage is that it’ an inefficient process - Insects started carrying pollen grains from male to female plants ~150 millio
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This note was uploaded on 09/22/2009 for the course BIOL 1002 taught by Professor Pomarico during the Spring '08 term at LSU.

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Chapter_25-_Plant_Reproduction - Chapter 25 BIO 1002...

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