Plant Reproduction and Development

  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. Image Upload 1
  5. Flower
    Organ for sexual reproduction of male and female organs
  6. Stamen
    • Male
    • Think stalk like filament with sac at top called anther
    • Produces haploid spores
  7. 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
  8. Spores vs seed
    • Haploid spores vs diploid seeds
    • Precurssor to gametophyte vs sphorphyte
    • Spores ~ egg and sperm (pollen plant sperm, specialized spores)
    • Seed ~ zygote
  9. Image Upload 2
  10. Petals
    Specialized leaves that protect pistil
  11. Pollen
    Develop from spores, from sporophyte
  12. Epicotyle
    Develops into leaves
  13. Cotyledons
    Seed leaves that store food for embryo
  14. Hypocotyle
    Develops into lower stem and root
  15. Endosperm
    • Grows and feed embryo
    • In dicots, coteyledon absorbs the endosperm
  16. Seed coat
    Develops the outer covering of ovule
  17. Fruit
    • Ripened ovary
    • Can be wet or dry (nut)
    • Serves as a way to disperse seed (baby plant)
  18. Short Day plants
    • Will flower when exposed to daylight hours shorter than threshold
    • Long night plants
  19. Long Day plants
    • Will flower with days longer than threshold
    • Short night plants
Card Set
Plant Reproduction and Development
Biology GRE