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Chapter 40 PLANT REPRODUCTION

Chapter 40 PLANT REPRODUCTION - Flowers,fruits,nutsandetc...

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Chapter 40  PLANT REPRODUCTION Flowers, fruits, nuts and etc. Summary *Asexual Reproduction - general *Sexual Reproduction – general *Flowering *Signals *Flower structure *Production of gametes *Pollination *Fertilization *Seed Development and germination Asexual Reproduction - General *Production of “clones”, fig 40.3 *Mechanisms: *Rhizomes     *Corms     *Plantlets     Figure 40-3 Sexual Reproduction - General *Involves: *Meiosis: *Fertilization: *Angiosperms produce flowers *Some angiosperms produce separate male and female flowers (imperfect flowers). *Monoecious     *Dioecious     1
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Angiosperms *Sexual reproduction involves flowers and seeds. *Flowering may be  controlled by a flowering hormone – florigen ?. *Flowering is associated with the activation of several genes. Flowering *What triggers flowering?  2 processes in series. *Phase change      = *External &/or internal cues      –  *External Cues *Photoperiod      (light ) dependent : *Temperature      dependent :   **Vernalization. *Internal cues = Autonomous pathway *Plants seem to “count” nodes on their stems and flower when a certain number of  nodes are present.
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