meiospore


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meiospore

[′mī·ə‚spȯr]
(biology)
A spore produced as the result of meiosis.
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Sporogenesis in bryophytes indicates that transfer of the sporopollenin wall from zygote to meiospore was accomplished by both precocious quadrilobing of the cytoplasm into the four future spore domains and a delay in timing of the deposition of the complex spore wall (sporoderm).
Whereas the meiospores (the haploid cells resulting from meiosis) of land plants are covered with desiccation resistant sporopollenin walls, the meiospores of algae are not.
Analysis of data on meiosis in all groups of bryophytes has led us to hypothesize that the sporopollenin wall typically covering the algal zygote was transferred directly to meiospores without an intervening sporophyte generation.
Blackmore and Barnes (1987) hypothesized that two factors contributed to evolution of the embryophyte spore wall; transfer of the sporopollenin wall from zygotes to meiospores, and the fusion of single lamina into multilaminate walls.
The word "spore" is used throughout this section because is generically includes pollen as well as all other meiospores.
At next stage, haploid cells (meiospores) were segmented after the decomposition of the special wall, and each of the meiospores is turned into young meiospores with big and central vacuoles and small and peripheral nucleus.
solenopsae meiospores are monokaryotic, the 16S rRNA gene is typically present in multiple copies within the genomes of microsporidia, either as tandem repeats (Kawakami et al.
Next, haploid cells (meiospores) are separated after the degeneration of the special wall, and each of the meiospores is turned into young meiospores with big and central vacuoles (V) and small and peripheral nucleus (N).
If the homologous theory of origin of the land-plant sporophyte were true, we would expect to find some evidence (in lower land plants) of either motile meiospores or of spores that exhibit (cytologically) a remnant of former flagellation.