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Pteridophyta
47.5
- 960 Views
- 60 Votes
- 24 Favorites
97.6
June 19, 2012
1. A diploid sporophyte phase produces haploid spores by meiosis (a process of cell division which reduces the number of chromosomes by a half).
2. A spore grows into a haploid gametophyte by mitosis (a process of cell division which maintains the number of chromosomes). The gametophyte typically consists of a photosynthetic prothallus.
3. The gametophyte produces gametes (often both sperm and eggs on the same prothallus) by mitosis.
4. A mobile, flagellate sperm fertilizes an egg that remains attached to the prothallus.
5. The fertilized egg is now a diploid zygote and grows by mitosis into a diploid sporophyte (the typical "fern" plant).
- Camera Canon EOS 500D
- Focal Length 100mm
- Shutter Speed 1/40 sec
- Aperture f/8
- ISO 100
- Category Nature
- Uploaded 12 months ago
- Taken April 21st 2012
- Copyright jo williams
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