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Academic literature on the topic 'Diakinesis'

Author: Grafiati

Published: 3 June 2025

Last updated: 20 July 2025

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Journal articles on the topic "Diakinesis"

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Reed, Kent M., Jack W. Sites Jr., and Ira F. Greenbaum. "Chromosomal synapsis and the meiotic process in male mesquite lizards, Sceloporus grammicus complex." Genome 35, no. 3 (1992): 398–408. http://dx.doi.org/10.1139/g92-060.

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Meiosis in males of the F5 cytotype of Sceloporus grammicus was examined through the analysis of synaptonemal complexes (SCs), diakinetic (metaphase I) nuclei, and secondary spermatocytes (metaphase II configurations). These data allowed the establishment of criteria for substaging of zygonema and pachynema, morphological characterization of the SC complement, and comparison of the orientation and segregation of the autosomes and sex chromosomes. The analysis of nuclei from all stages of meiotic prophase I (leptonema through diakinesis) provided a useful means of partitioning the temporal sequ

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Wolf, Paul G., Pamela S. Soltis, and Douglas E. Soltis. "Tetrasomic inheritance and chromosome pairing behaviour in the naturally occurring autotetraploid Heuchera grossulariifolia (Saxifragaceae)." Genome 32, no. 4 (1989): 655–59. http://dx.doi.org/10.1139/g89-494.

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Inheritance patterns at four allozyme loci and chromosome pairing behaviour at diakinesis were examined in the naturally occurring autotetraploid Heuchera grossulariifolia. Segregation patterns for Tpi, Pgi, Pgm-2, and Lap deviated significantly from all possible disomic models. All patterns were consistent with tetrasomic inheritance of these marker loci. No chromatid segregation was detected electrophoretically. Meiotic chromosome configurations at diakinesis in 45 cells were compared with a previously published model to test for autopolyploid-like chromosome pairing. Using the observed chia

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Maguire, Marjorie P., and Janet Day Jackson. "Two well-known mutants of chiasma maintenance function in maize are allelic." Genome 41, no. 3 (1998): 417–21. http://dx.doi.org/10.1139/g98-029.

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By a series of traditional crosses, allelism has been tested for two maize recessive mutants of independent origin, dy1 and dsy1, both called desynaptic. These mutants both display loss of chiasmate association during diakinesis (late prophase I) but at differing frequencies. This chiasma loss happens before nucleolar loss and nuclear membrane system breakdown. That crossovers have occurred to establish the chiasmata in the first place has been documented by diakinesis-stage separation of heterozygous heterochromatic regions in univalents formed by bivalent-association breakdown. In the presen

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Sikiru, Omokanye Babatunde. "Chromosomes Behavior at Meiosis in Chlorophytum stenopetalum Bak at Pachytene, Diakinesis and Diplotene." Journal of Applied Sciences and Environmental Management 25, no. 4 (2021): 493–96. http://dx.doi.org/10.4314/jasem.v25i4.

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Meiotic prophase is classically subdivided into five stages: leptotene, zygotene, pachytene, diplotene, and diakinesis. The objective of this paper is to evaluate the behaviours of Chromosomes in Chlorophytum stenopetalum Bak.at pachytene /diakinesis and metaphase. The flower buds at right age were harvested, fixed in Cornoy’s solution (3 part of absolute alcohol and 1 part of acetic alcohol) and preserved in a refrigerator at -4°𝐶 for at least thirty minutes. The flower buds were then hydrolyzed in 10% HCl for 3-5 minutes. Prepared slides were viewed using an Armscope microscope equipped with

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Diluraj, Sangeetha. "Tertiary trisomics in 2n = 12 Coix taxon." Annals of Plant Sciences 7, no. 4 (2018): 2198. http://dx.doi.org/10.21746/aps.2018.7.4.21.

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Tertiary trisomics have been isolated from the domesticated outcrossed population of a comparatively new taxon of Coix with 2n = 12 chromosome number and also from the selfed progenies of the chromosomal variants ranging from 2n=11 to 2n=13. Cytological analysis of these trisomics indicated that different chromosomal associations forming a trivalent, pentavalent and univalent were frequent at diakinesis. Disomics (2n = 12) and their monosomics (2n-1; 2n = 11) showing interchanged quadrivalents at diakinesis were observed to be the main sources of these tertiary trisomics.

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Cheng, B. F., W. K. Heneen, and B. Y. Chen. "Meiotic studies on a Brassica campestris–alboglabra monosomic addition line and derived B. campestris primary trisomics." Genome 37, no. 4 (1994): 584–89. http://dx.doi.org/10.1139/g94-083.

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Diakinesis chromosomes were studied in pollen mother cells of Brassica campestris (2n = 20, genome AA), B. alboglabra (2n = 18, genome CC), a B. campestris–alboglabra monosomic addition line (AA + 1 chromosome from the C genome), and four derived B. campestris primary trisomics. The nucleolar chromosomes of B. campestris were distinguishable by their morphology at diakinesis. The alien C-genome chromosome in the addition line paired preferentially with the nucleolar chromosome of the A genome. Very rarely, it paired with another pair of the A genome. Thus, it was concluded that the alien C-gen

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HULTÉN, MAJ. "Chiasma distribution at diakinesis in the normal human male." Hereditas 76, no. 1 (2009): 55–78. http://dx.doi.org/10.1111/j.1601-5223.1974.tb01177.x.

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SB, Omokanye. "Meiotic Chromosomes Behavious in Chlorophytum stenopetalum Bak." Research International Journal of Plant Science and Ecology 01, no. 01 (2020): 001–3. http://dx.doi.org/10.37179/rijpse.000001.

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Chromosomes behavior at meiosis in Chlorophytum stenopetalum Bak. was investigated especially at pachytene /diakinesis and metaphase. The 􀏐lower buds at right age were harvested, 􀏐ixed in Cornoy’s solution (3 part of absolute alcohol and 1 part of acetic alcohol) and preserved in a refrigerator at -4 for at least thirty minutes. The 􀏐lower buds were then hydrolyzed in 10% HCl for 3-5 minutes. Prepared slides were viewed using an Armscope microscope equipped with digital automatic camera. At diakinesis seven bivalents (7 II) were predominantly observed (74.2%). Chromosomal stickiness is quite e

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Wauben-Penris, P. J. J., G. P. J. M. van Meel, and P. de Boer. "Spermatogenic delay and increased chiasma frequency in T70H/+ male mice with hydroxyurea–Trenimon limited spermatocyte populations." Canadian Journal of Genetics and Cytology 27, no. 2 (1985): 192–99. http://dx.doi.org/10.1139/g85-029.

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T(1;13)70H/+ male mice were treated with hydroxyurea (HU) and Trenimon (T). This karyotype offers excellent possibilities for estimating number and position of chiasmata and segregation in meiotic anaphase I. By their cell-killing action during spermatogenesis, HU and T produce large gaps in the spermatogenic line. The surviving population between the gaps was analysed at diakinesis – metaphase I and metaphase II. We found by autoradiography a considerable retardation of the development from resting primary spermatocytes (RPS) to metaphase I and II as compared to untreated T70H/+ males. Furthe

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Maguire, M. P., R. W. Riess, and A. M. Paredes. "Evidence from a maize desynaptic mutant points to a probable role of synaptonemal complex central region components in provision for subsequent chiasma maintenance." Genome 36, no. 5 (1993): 797–807. http://dx.doi.org/10.1139/g93-105.

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Homozygotes for the dsy1 desynaptic mutant of maize show massive failure of chiasma maintenance during diplotene and diakinesis. Although some chiasmata persist until anaphase I in most microsporocytes expressing this mutant, homozygotes are completely or nearly completely sterile, owing apparently to disjunctive irregularities. Pachytene synaptic errors and some synaptic failure also are found, but recombination nodules are common in homologously synapsed regions, and equational separation of a heterozygous knob into univalents or open arms at diakinesis clearly demonstrates that chiasma fail

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Book chapters on the topic "Diakinesis"

1

"Diakinesis." In Encyclopedia of Genetics, Genomics, Proteomics and Informatics. Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-6754-9_4397.

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"diakinesis, n." In Oxford English Dictionary, 3rd ed. Oxford University Press, 2023. http://dx.doi.org/10.1093/oed/3889138874.

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Reports on the topic "Diakinesis"

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Singh, Anjali. Estimating the Chiasma Frequency in Diplotene-Diakinesis Stage. ConductScience, 2020. http://dx.doi.org/10.55157/cs20200925.

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Chiasma is the point of crossing over or site where the exchange of genetic material takes place between two homologous, non-sister chromatids. The crossover occurs in the pachytene stage, however, it is observed in the diplotene stage of meiosis-I[2]. The cross-over between the two homologs also creates a new combination of parental genes, forming recombinants. The recombination of the genes causes variation in the population and exert a profound effect on genomic diversity and evolution. Meiotic recombination and variation in the population have been a concern for scientists to understand th

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