Plant Reproduction and Development

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Author:
rica_ross
ID:
235232
Filename:
Plant Reproduction and Development
Updated:
2013-09-24 19:57:33
Tags:
Biology GRE
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Biology GRE
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  1. Plant Repro, Alternation of Geneations
    Characterized by an alternation between diploid sphorophyte and haploid gametophye generations
  2. Key Evolutionary Adaptation among land plants
    Seed and fruit
  3. Advantages of Haploid and Diploid generations
    • Haploid generations may be able to wipe out harmful recessive alleles, haploid only have one genetype either R or r 
    • So if r is harmful there is less of a chance it will get passed on
  4. Flower
    Organ for sexual reproduction of male and female organs
  5. Stamen
    • Male
    • Think stalk like filament with sac at top called anther
    • Produces haploid spores
  6. Pistil
    • Female
    • Stigma is sticky top part of plower that catches polled or plant sperm
    • Style tubelike structure that connectes stigma to ovary
    • Ovary enlarged base of pistil
  7. Spores vs seed
    • Haploid spores vs diploid seeds
    • Precurssor to gametophyte vs sphorphyte
    • Spores ~ egg and sperm (pollen plant sperm, specialized spores)
    • Seed ~ zygote
  8. Petals
    Specialized leaves that protect pistil
  9. Pollen
    Develop from spores, from sporophyte
  10. Epicotyle
    Develops into leaves
  11. Cotyledons
    Seed leaves that store food for embryo
  12. Hypocotyle
    Develops into lower stem and root
  13. Endosperm
    • Grows and feed embryo
    • In dicots, coteyledon absorbs the endosperm
  14. Seed coat
    Develops the outer covering of ovule
  15. Fruit
    • Ripened ovary
    • Can be wet or dry (nut)
    • Serves as a way to disperse seed (baby plant)
  16. Short Day plants
    • Will flower when exposed to daylight hours shorter than threshold
    • Long night plants
  17. Long Day plants
    • Will flower with days longer than threshold
    • Short night plants

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