Plant life cycle and alternation of Generation
Plant life cycle and alternation of Generation –
- Alternate stages of haploid (n) and Diploid (2n) phase in life cycle of plants.
- Three Patterns -
Haplontic | Diplontic | Haplodiplontic |
- Dominating phase haploid (n). -only zygote diploid (2n). -Haploid spores form the main plant body
eg. Algae viz. Ulothrix, Spirogyra etc.
| -Dominating phase diploid (2n). -Haploid phase only in single cell or few celled gametophyte. -Zygote forms embryo which forms Sporophyte (main plant body). eg. Gymnosperms& Angiosperms | -Intermediate i.e.haploid& diploid stages equal. -Gametophyte & Sporophyte stages both may be free living.
eg. Bryophytes&Pteridophyte. |
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