Chapter 39
Reproduction in plants
aka. How plants have sec
aka. Plant sexy time
- Most flowering plants display sexual reproduction
- Two gametes fuse to produce offspring with a unique combination of genes
- They undergo Alternation of Generations
- Two multicellular life cycle stages
- diploid
- Spore producing sporophyte
- produces spores by meiosis
- a type of cell division that results in four daughter cells each with half the number of chromosomes of the parent cell, as in the production of gametes and plant spores.
- produces spores by meiosis
- Spore producing sporophyte
- haploid
- Gamete producing gametophyte
- produces gametes by mitosis
- a type of cell division that results in two daughter cells each having the same number and kind of chromosomes as the parent nucleus, typical of ordinary tissue growth.
- produces gametes by mitosis
- Gamete producing gametophyte
- Egg is Female
- Sperm is Male
Evolutionary Trends in the Plant Kingdom
- Sporophyte has become larger, more complex
- Flowering plants
- Sporophyte independent
- Dependent gametophyte is only a few cells contained within flowers
- Flowering plants
- Gametophyte has become smaller, less complex
- Moss
- Sporophytes small and dependent on gametohyte (Dominant form)
- Moss
- Female
- 7 cells
- Male
- 2-3 cells