Alternation of Generations
Alteration of Generations
"Alternation of Generations" is a term used to explain the life cycle and pattern of reproduction in certain vascular plants, protists and fungi. Usually generations of a species take one complete life cycle; therefore, in order to avoid confusion, this term is usually replaced with the term "Alternation of Phases of a single generation."
In "Alternation of Generations," the process of reproduction is different from other reproductions; it keeps moving back and forth from a sexual from of reproduction in one generation to an asexual form of reproduction in the other generation (Polunin, 1960). Each phase of the life cycle of organisms possessing "Alternation of Generations" contains one or two independent living organism gametophyte and a sporophyte. Sporophyte and gametophyte come from the concepts: spore bearing stage (sporophyte) and gamete bearing stage (gametophyte). Genetically, a gametophyte (which can be a tissue or plant) is a haploid with single set of chromosomes, while a sporophyte (which can also be a tissue or plant) is a diploid with double set (paired) of chromosomes.
In the alternation of generation process, a haploid belonging to the gametophyte...
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