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Chapter 29

Chapter 29 Detailed Notes

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Department
Biology
Course
BI111
Professor
Tristan Long
Semester
Winter

Description
Chapter 29: Reproduction and Development in Flowering Plants Some Vascular Plants Evolved Separate Male and Female Gametophytes Heterosporous plants produce 2 types of spores  Endosporous development: In many heterosporous plants,  gametophytes produced by spores develop inside spore wall  Provides increased protection for gametes, and later, for  developing embryo Flowering Plant Life Cycle 29.1a Diploid and Haploid Generations Arise in the Angiosperm Life Cycle o Angiosperm zygote develops into an embryo enclosed within a seed o In a seed, early versions of the basic plant tissue systems are already in place, so  the embryo is already a sporophyte: refers to a diploid, spore­producing body of a  plant o Inflorescence: group of flowers on the same floral shoot Flower Structure  Perfect flowers  Both stamens and carpels on same flower  Imperfect flowers  Stamens or carpels, not both  Dichogamy   Sequential hermaphroditism  Monoecious plants  Male flowers and female flowers (staminate and pistilate flowers) on same  plant Example: Corn  Dioecious plants (rarer)  Some plants with only male flowers, some with only female flowers  Example: Willows, Ginko, Holly  Herkogamy  Approach Herkogamy (pin)  Reverse Herkogamy (thrum) Pollen Grains  Meiosis produces haploid microspores  Mitosis in microspore produces a pollen grain  Immature male gametophyte  One cell develops into two sperm cells  Other cell produces pollen tube  Ovules  Form inside carpel, on wall of ovary  Micropyle opening at one end  Meiosis produces four
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