A report on Alternation of generations
Predominant type of life cycle in plants and algae.
- Alternation of generations23 related topics with Alpha
Gametophyte
12 linksA gametophyte is one of the two alternating multicellular phases in the life cycles of plants and algae.
Plant
8 linksPlants are predominantly photosynthetic eukaryotes of the kingdom Plantae.
Plants are predominantly photosynthetic eukaryotes of the kingdom Plantae.
Plants are characterized by sexual reproduction and alternation of generations, although asexual reproduction is also common.
Spore
8 linksUnit of sexual or asexual reproduction that may be adapted for dispersal and for survival, often for extended periods of time, in unfavourable conditions.
Unit of sexual or asexual reproduction that may be adapted for dispersal and for survival, often for extended periods of time, in unfavourable conditions.
This cycle is known as alternation of generations.
Sporophyte
9 linksDiploid multicellular stage in the life cycle of a plant or alga.
Diploid multicellular stage in the life cycle of a plant or alga.
This cycle is known as alternation of generations or alternation of phases.
Fern
9 linksMember of a group of vascular plants (plants with xylem and phloem) that reproduce via spores and have neither seeds nor flowers.
Member of a group of vascular plants (plants with xylem and phloem) that reproduce via spores and have neither seeds nor flowers.
Like all land plants, they have a life cycle referred to as alternation of generations, characterized by alternating diploid sporophytic and haploid gametophytic phases.
Sexual reproduction
7 linksType of reproduction that involves a complex life cycle in which a gamete with a single set of chromosomes (haploid) combines with another to produce a zygote that develops into an organism composed of cells with two sets of chromosomes (diploid).
Type of reproduction that involves a complex life cycle in which a gamete with a single set of chromosomes (haploid) combines with another to produce a zygote that develops into an organism composed of cells with two sets of chromosomes (diploid).
This type of life cycle, involving alternation between two multicellular phases, the sexual haploid gametophyte and asexual diploid sporophyte, is known as alternation of generations.
Ploidy
7 linksNumber of complete sets of chromosomes in a cell, and hence the number of possible alleles for autosomal and pseudoautosomal genes.
Number of complete sets of chromosomes in a cell, and hence the number of possible alleles for autosomal and pseudoautosomal genes.
This is called alternation of generations.
Biological life cycle
3 linksSeries of changes in form that an organism undergoes, returning to the starting state.
Series of changes in form that an organism undergoes, returning to the starting state.
For plants and many algae, there are two multicellular stages, and the life cycle is referred to as alternation of generations.
Meiosis
8 linksSpecial type of cell division of germ cells in sexually-reproducing organisms that produces the gametes, such as sperm or egg cells.
Special type of cell division of germ cells in sexually-reproducing organisms that produces the gametes, such as sperm or egg cells.
Consequently, this cycle is also known as the alternation of generations.
Algae
5 linksInformal term for a large and diverse group of photosynthetic eukaryotic organisms.
Informal term for a large and diverse group of photosynthetic eukaryotic organisms.
These probably had an isomorphic alternation of generations and were probably filamentous.