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In most coralline algae, a cluster of reproductive cells forms in the middle layer of the alga, and is engulfed by the surrounding tissue, which grows up and over the reproductive cells to form a roof and a uniporate conceptacle.
Diagram showing the alternation of generations between a diploid sporophyte (bottom) and a haploid gametophyte (top) A sporophyte (/ ˈ s p ɔːr. ə ˌ f aɪ t /) is the diploid multicellular stage in the life cycle of a plant or alga which produces asexual spores. This stage alternates with a multicellular haploid gametophyte phase.
Chlorarachniophytes contain a nucleomorph genome that is diploid and cryptomonads contain a nucleomorph genome that is tetraploid. [12] The unique combination of host cell and complex plastid results in cells with four genomes: two prokaryotic genomes ( mitochondrion and plastid of the red or green algae) and two eukaryotic genomes (nucleus of ...
The two species Teleaulax amphioxeia and Plagioselmis prolonga are now considered to be the same species, where T. amphioxeia is the diploid form and P. prolonga is the haploid form. The diploid form is most common when there are more nutrients in the water. Two haploid cells will often fuse to form a diploid cell, mixing their genes. [11]
Valonia fastigiata. The life history of the genus Valonia is indistinguishable with the other Siphonocladales family members, particularly genus Boergesenia. Similar in several seaweeds, they exhibit a diplohaplontic life cycle, meaning an alternation between haploid (gametophytic) and diploid (sporophytic) free-living forms completes the cycle.
Batrachospermum is a genus of red algae from the family Batrachospermaceae.Due to its complex biological life cycle, descriptions of the taxon typically focus on gametophytes, while sporophytes, i.e., carposporophytes, are filamentous structures growing on the gametophyte, on which they depend.
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