Results 101 to 110 of about 286 (125)
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Chromosoma, 1970
AdultOncopeltus fasciatus males were irradiated with 9000 R of X-rays, and crossed to untreated females. Fertility was reduced to 4.1%. F1 males and F2 and F3 males and females were outcrossed to untreated partners. All F1 males were partially or totally sterile and a significant number of F2 and F3 males and females had reduced fertility.
L E, LaChance +2 more
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AdultOncopeltus fasciatus males were irradiated with 9000 R of X-rays, and crossed to untreated females. Fertility was reduced to 4.1%. F1 males and F2 and F3 males and females were outcrossed to untreated partners. All F1 males were partially or totally sterile and a significant number of F2 and F3 males and females had reduced fertility.
L E, LaChance +2 more
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Mutation Research - Fundamental and Molecular Mechanisms of Mutagenesis, 1979
Chromosomes of the holokinetic organization type were irradiated with X-rays in various stages of meiosis in unfertilized eggs of Tetranychus urticae Koch. Visible cytological aberrations, lethality and sterility were investigated in subsequent generations.
M J Tempelaar
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Chromosomes of the holokinetic organization type were irradiated with X-rays in various stages of meiosis in unfertilized eggs of Tetranychus urticae Koch. Visible cytological aberrations, lethality and sterility were investigated in subsequent generations.
M J Tempelaar
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The Nucleus, 2012
Constitutive heterochromatin shows a very diverse distribution pattern and base composition in different species. Serinetha augur (Rhopalidae) and Riptortus pedestris (Alydidae) share the same diploid chromosome complement i.e. 2n = 13 = 10A + 2 m + XO.
Harbhajan Kaur +2 more
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Constitutive heterochromatin shows a very diverse distribution pattern and base composition in different species. Serinetha augur (Rhopalidae) and Riptortus pedestris (Alydidae) share the same diploid chromosome complement i.e. 2n = 13 = 10A + 2 m + XO.
Harbhajan Kaur +2 more
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[Behavior of holokinetic chromosomes in the spermatogenesis of bugs].
Tsitologiia, 1977Chromosomes were studied on the spermatogonial metaphase and on different stages of meiotic division in males of Eurydeme geblery Kol. and E. ventrale Kol. The set of male chromosomes of the above species involves six pairs of autosomes and an XY sex pair, which is commonly the case in Pentatomidae.
V G, Kuznetsova, M B, Petropavlovskaia
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Protoplasma, 1996
Kinetochore structure was examined in metaphase spermatogonia and primary spermatocytes of the red firebug,Pyrrhocoris apterus (Pyrrhocoridae, Hemiptera). Chromosome spreads were analysed using light microscopy and serial sections through spindles were studied using electron microscopy.
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Kinetochore structure was examined in metaphase spermatogonia and primary spermatocytes of the red firebug,Pyrrhocoris apterus (Pyrrhocoridae, Hemiptera). Chromosome spreads were analysed using light microscopy and serial sections through spindles were studied using electron microscopy.
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1994
The evolution of sexual reproduction has seen a recent and major resurgence as a topic of interest. Many authors (e.g. Ghiselin 1974, Williams 1975, Maynard Smith 1978, Bell 1982, Shields 1982, Bull 1983, Michod and Levin 1988) have refined the now-familiar arguments that generally cast sexual reproduction as the alternative to the asexual production ...
Dana L. Wrensch +2 more
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The evolution of sexual reproduction has seen a recent and major resurgence as a topic of interest. Many authors (e.g. Ghiselin 1974, Williams 1975, Maynard Smith 1978, Bell 1982, Shields 1982, Bull 1983, Michod and Levin 1988) have refined the now-familiar arguments that generally cast sexual reproduction as the alternative to the asexual production ...
Dana L. Wrensch +2 more
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Holokinetic drive: centromere drive in chromosomes without centromeres.
Evolution; international journal of organic evolution, 2015Similar to how the model of centromere drive explains the size and complexity of centromeres in monocentrics (organisms with localized centromeres), our model of holokinetic drive is consistent with the divergent evolution of chromosomal size and number in holocentrics (organisms with nonlocalized centromeres) exhibiting holokinetic meiosis ...
Petr, Bureš, František, Zedek
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Chromosome Research, 2003
Telomeres, besides their main role in the protection and maintenance of chromosome ends, have several other vital functions in the cell cycle. We studied their role in the achiasmatic meiosis of female Lepidoptera, insects with holokinetic chromosomes. By fluorescence in-situ hybridization (FISH) with the insect telomeric probe, (TTAGG)n, we mapped the
Alena, Rego, Frantisek, Marec
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Telomeres, besides their main role in the protection and maintenance of chromosome ends, have several other vital functions in the cell cycle. We studied their role in the achiasmatic meiosis of female Lepidoptera, insects with holokinetic chromosomes. By fluorescence in-situ hybridization (FISH) with the insect telomeric probe, (TTAGG)n, we mapped the
Alena, Rego, Frantisek, Marec
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Chromosoma, 1983
The association of microtubules with mitotic holokinetic chromosomes of Tetranychus urticae Koch was investigated in serial ultrathin sections. Reconstructions from 14 series showed that 60–100 microtubules were associated with the entire poleward surfaces of the chromosomes.
Tempelaar, M.J., Drenth-Diephuis, L.J.
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The association of microtubules with mitotic holokinetic chromosomes of Tetranychus urticae Koch was investigated in serial ultrathin sections. Reconstructions from 14 series showed that 60–100 microtubules were associated with the entire poleward surfaces of the chromosomes.
Tempelaar, M.J., Drenth-Diephuis, L.J.
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Holokinetische Chromosomen bei Haematopinus suis (Anoplura, Haematopinidae)
Chromosoma, 19551. Haematopinus suis L. hat in beiden Geschlechtern 2n = 10 Chromosomen. Vier Paare sind ungefahr gleichlang, das funfte ist etwas langer; ein heteromorphes Paar ist nicht vorhanden. 2. Die Spermatogenese weicht vom Normalschema stark ab. Am Ende der Vermehrungsphase der primaren, diploiden Spermatogonien erfolgt eine Chromosomenpaarung,
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