B-Chromosome Systems in Flowering Plants and Animal Species

Jones, Robert N.

doi:10.1016/s0074-7696(08)60951-1

Cited by 176 publications

(99 citation statements)

References 428 publications

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“…Hewitt (1976) also reported a significantly lower autosomal mean chiasma frequency in females of Myrineleotettix maculatus, but there was no sex difference in the distribution of chiasmata in this case. Finally, Chorthippus brunneus, the common field grasshopper, shows no significant difference in autosomal chiasma frequency between the sexes but females show a tendency to form more distal chiasmata than males although the difference is not great (Jones et a!., 1975).…”

Section: Discussionmentioning

confidence: 89%

“…When allowance is made for the presence of an additional (X) bivalent in females, the difference between the sexes is even more pronounced. However, as discussed in earlier papers (Jones et a!., 1975;Hewitt, 1976;Fletcher and Hewitt, 1980), the allowance to be made for the X-bivalent cannot be determined exactly when the X-bivalent itself is indistinguishable from similar sized autosomal bivalents. In the case of E. plorans, it is likely to lie in the range between 1 chiasma (the minimum obligate chiasma possessed by each bivalent) and 13 chiasmata (an estimate based on the relative length of the X-chromosome and the mean chiasma frequency of oocytes).…”

Section: Discussionmentioning

confidence: 99%

“…These problems were overcome by the development of a suitable squash technique for examining first metaphase nuclei (Perry and Jones, 1974). Subsequently this method, or modifications of it, have been used to study oocyte first metaphases in a number of grasshopper species (Jones et a!., 1975;Hewitt, 1976;Fletcher and Hewitt, 1980), but the number of different species examined is still relatively low.…”

Section: Introductionmentioning

confidence: 99%

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Sex differences in chiasma frequency and distribution in natural populations of Eyprepocnemis plorans containing B-chromosomes

1987

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Chiasma frequencies and distributions were compared in males and females, with and without different types of B-chromosomes, from four Spanish natural populations of Eyprepocnemis plorans. Mean cell chiasma frequency and mean autosomal chiasma frequency were substantially and significantly lower in females than in males. Females also showed altered chiasma distributions compared with males, with fewer proximal chiasmata and more interstitial and distal chiasmata. A variety of sex differences in meiotic chiasmata have now been described in the Orthoptera and these are compared and discussed. B-chromosomes had no effects on mean chiasma frequency and relatively little general effect on chiasma distribution, although some minor effects of B-chromosomes on chiasma distribution were detected in certain populations and classes of bivalents. In some of these cases B-chromosomes affected chiasma distribution in females but not in males.

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Section: Discussionmentioning

confidence: 89%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sex differences in chiasma frequency and distribution in natural populations of Eyprepocnemis plorans containing B-chromosomes

1987

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“…As mentioned above, DAPI fluorescence staining performed after in situ hybridisation allowed the observation of a C-banding-like staining differentiation. The explanation for this phenomenon is that chromosome preparations in the in situ hybridization protocol, are subject to a B chromosomes have been found in a number of different species of the genus Crepis (reviewed by Jones, 1975;Jones and Rees, 1982). Rutishauser use of an in situ hybridization technique.…”

Section: Resultsmentioning

confidence: 99%

Ribosomal RNA genes in B chromosomes of Crepis capillaris detected by non-radioactive in situ hybridization

Małuszyńska

Schweizer

1989

Heredity

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A non-radioactive in Situ hybridization method using biotin-labelled rDNA has made it possible to localize rRNA genes not only at the secondary constriction in both homologous chromosomes No. 3 of Crepis capillaris but also in the B chromosomes occurring in the plants employed. Very clear dot-like rDNA signals at the telomeres of both arms were observed in all B chromosomes. Histochemical silver staining, which is indicative of transcriptional activity of rRNA gene clusters, resulted in both darkly-staining nucleolar constrictions of chromosomes No. 3 and silver deposits at the telomeres of Bs. We conclude that the B chromosomes of C. capillaris are isochromosomes with active rRNA genes located near both telomeres.

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“…La mayoria de los B's en plantas y animales son mit6ticamente estables (Jones, 1975). Unaminoria de especies posee cromosomasB mit6ticamentein-estables, los cuales varian en n(unero entre las c6lu1as de un mismo individuo.…”

Section: Introducci6nunclassified

Cromosomas B mitoticamente inestables en el saltamontes Sphingonotus Haitiensis Saus (Orthoptera : Acrididae)

1989

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B-Chromosome Systems in Flowering Plants and Animal Species

Cited by 176 publications

References 428 publications

Sex differences in chiasma frequency and distribution in natural populations of Eyprepocnemis plorans containing B-chromosomes

Sex differences in chiasma frequency and distribution in natural populations of Eyprepocnemis plorans containing B-chromosomes

Ribosomal RNA genes in B chromosomes of Crepis capillaris detected by non-radioactive in situ hybridization

Cromosomas B mitoticamente inestables en el saltamontes Sphingonotus Haitiensis Saus (Orthoptera : Acrididae)

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