karyogamy वाक्य
उदाहरण वाक्य
मोबाइल
- In haploid organisms that lack sexual cycles, karyogamy can also be an important source of genetic variation during the process of forming somatic diploid cells.
- Nuclear karyogamy and meiosis ( sexual recombination ) occur within the zygospores, which are thought to be long-lived and resistant to adverse conditions.
- The half-bridge is the site of new SPB assembly, and it also plays a role in cytoplasmic microtubule nucleation during G1 and karyogamy.
- In the case of dormant spores in eukaryotes, sporogenesis often occurs as a result of fertilization or karyogamy forming a diploid spore equivalent to a zygote.
- Fusion of the nuclei ( karyogamy ) takes place in the U-shaped cells in the hymenium, and results in the formation of a diploid zygote.
- The copulated union of multinuclear cells is folloved after a more or less long period dikaryophase, by a pairwise fusion ( karyogamy ) of sexually different nuclei.
- The nuclei do not immediately fuse, and remain haploid in a n + n state until the very onset of meiosis : this phenomenon is called delayed karyogamy.
- Karyogamy between these two types of gametangia one being from the A1 sexualtype and the other of the A2 sexual type results in the formation of an overwintering oospore.
- :Thus in Ascomycota, for example, the nuclei from the two parent individuals ( not genetically identical ) fuse to each other ( karyogamy ) and form the diploid zygote nucleus.
- In some fungi, two different haploid mating types if compatible merge . nuclei, i . e ., one from each parent that eventually undergoes karyogamy and meiosis to complete the sexual cycle.
- Basidiospores are more or less the same, except that in Basidiomycota, the two haploid nuclei of the parent individuals coexist in the same cell ( even vegetative ones ) for a longer time without undergoing karyogamy.
- In a typical Basidiomycota lifecycle the long lasting dikaryons periodically ( seasonally or occasionally ) produce basidia, the specialized usually club-shaped end cells, in which a pair of compatible nuclei fuse ( karyogamy ) to form a diploid cell.
- Unlike the hymenoascomycetes, the loculoascomycete ascoma originates prior to karyogamy in the dikaryon, with the correlated character state being the functionally two-walled ascus which ruptures in a fissitunicate ( like a Jack-in-the-box ) fashion.
- A discarded hypothesis held that a second karyogamy event occurred in the ascogonium prior to ascogeny, resulting in a tetraploid nucleus which divided into four diploid nuclei by meiosis and then into eight haploid nuclei by a supposed process called brachymeiosis, but this hypothesis was disproven in the 1950s.
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