Genotype-dependent effect of B-chromosomes on chiasma frequency in Eyprepocnemis plorans (Acrididae: Orthoptera)

Genetica ◽  
1982 ◽  
Vol 59 (3) ◽  
pp. 223-227 ◽  
Author(s):  
N. Henriques-Gil ◽  
J. L. Santos ◽  
R. Giraldez
Keyword(s):  
Chiasma Frequency ◽  
B Chromosomes ◽  
Eyprepocnemis Plorans ◽  
Dependent Effect

Factors affecting the meiotic pairing behaviour of B chromosomes in the grasshopper Eyprepocnemis plorans

1984 ◽  
Vol 26 (6) ◽  
pp. 664-668 ◽  
Author(s):  
N. Henriques-Gil ◽  
P. Arana ◽  
J. L. Santos
Keyword(s):  
Chiasma Frequency ◽  
Chiasma Formation ◽  
B Chromosome ◽  
B Chromosomes ◽  
Meiotic Pairing ◽  
Eyprepocnemis Plorans ◽  
Factors Affecting ◽  
Chiasma Localization ◽  
A Site ◽  
Pairing Behaviour

A study of the meiotic behaviour of different B-chromosome variants in the acridid grasshopper Eyprepocnemis plorans demonstrates that pairing and chiasma formation in these supernumerary chromosomes depend both on genotypic factors and on the structure of the B chromosomes themselves. Genotypic effects are evidenced by the differences in chiasma frequency which the same B-chromosome combinations show in different individuals. Structural effects can be inferred from the fact that 9 of the 14 known known B variants carry a unique site to which interstitial chiasmata are confined, whereas such a site is lacking in the other five variants.Key words: B chromosomes, C-bands, chiasma frequency, chiasma localization.

Microdissection and Chromosome Painting of X and B Chromosomes in the Grasshopper Eyprepocnemis plorans

2009 ◽  
Vol 125 (4) ◽  
pp. 286-291 ◽  
Author(s):  
M. Teruel ◽  
J. Cabrero ◽  
F. Perfectti ◽  
M.J. Acosta ◽  
A. Sánchez ◽  
...  
Keyword(s):  
Chromosome Painting ◽  
B Chromosomes ◽  
Eyprepocnemis Plorans

scholarly journals Preferential Occupancy of R2 Retroelements on the B Chromosomes of the Grasshopper Eyprepocnemis plorans

PLoS ONE ◽  
2014 ◽  
Vol 9 (3) ◽  
pp. e91820 ◽  
Author(s):  
Eugenia E. Montiel ◽  
Josefa Cabrero ◽  
Mercedes Ruiz-Estévez ◽  
William D. Burke ◽  
Thomas H. Eickbush ◽  
...  
Keyword(s):  
B Chromosomes ◽  
Eyprepocnemis Plorans

Undertransmission of a supernumerary chromosome segment through heterozygous females possessing B chromosomes in the grasshopper Eyprepocnemis plorans

Genome ◽  
1994 ◽  
Vol 37 (4) ◽  
pp. 705-709 ◽  
Author(s):  
M. D. López-León ◽  
M. C. Pardo ◽  
J. Cabrero ◽  
J. P. M. Camacho
Keyword(s):  
Extra Chromosome ◽  
Natural Populations ◽  
Supernumerary Chromosome ◽  
B Chromosomes ◽  
Chromosome Segment ◽  
Transmission Ratio ◽  
Eyprepocnemis Plorans ◽  
Mendelian Transmission

The transmission ratio (ks) for a supernumerary chromosome segment was studied in a total of 54 heterozygous females collected from two Spanish natural populations of the grasshopper Eyprepocnemis plorans. Our analysis clearly demonstrated that ks is negatively dependent on the number of B chromosomes in the female. The possible mechanisms by which B chromosomes may cause undertransmission of the supernumerary segment, and the implications of this phenomenon for the maintenance of this extra chromosome segment, are discussed.Key words: supernumerary segments, B chromosomes, Mendelian transmission, grasshoppers.

scholarly journals Protein-coding genes in B chromosomes of the grasshopper Eyprepocnemis plorans

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Beatriz Navarro-Domínguez ◽  
Francisco J. Ruiz-Ruano ◽  
Josefa Cabrero ◽  
José María Corral ◽  
María Dolores López-León ◽  
...  
Keyword(s):  
B Chromosomes ◽  
Eyprepocnemis Plorans ◽  
Protein Coding ◽  
Protein Coding Genes

THE EFFECTS OF SUPERNUMERARY CHROMATIN IN THREE SPECIES OF GRASSHOPPER

1974 ◽  
Vol 16 (2) ◽  
pp. 285-296 ◽  
Author(s):  
Gilbert L. Schroeter ◽  
Godfrey M. Hewitt
Keyword(s):  
Life Cycle ◽  
Chiasma Frequency ◽  
Genetic Material ◽  
B Chromosomes ◽  
Population Variability ◽  
The Other ◽  
Direct Effects ◽  
Apparent Effect ◽  
Other Hand ◽  
The Mean

The chiasma frequencies in males of three species of grasshopper with and without B-chromosomes and supernumerary segments were scored at diplotene. The partially heterochromatic B's found in some individuals of Chimarocephala pacifica pacifica have no effect on chiasma frequencies. On the other hand, heterochromatic supernumerary segments in Oedaleonotus phryneicus males significantly increase the mean chiasma frequencies over individuals without them but not the between-cell variances. In Camnula pellucida neither the mitotically unstable B's nor supernumerary segments have any apparent effect on chiasma.frequencies. The supernumerary elements in Chimarocephala pacifica and Camnula pellucida may, however, produce other effects during the life cycle These and previous observations suggest that polymorphism involving extra genetic material in grasshoppers can result in increased population variability via two different means: (1) by producing variation in chiasma frequency or (2) through direct effects in the individuals possessing it. The importance of such a mechanism for producing variation is discussed.

The effect of B chromosomes on mating success of the grasshopper Eyprepocnemis plorans

Genetica ◽  
1996 ◽  
Vol 97 (2) ◽  
pp. 197-203 ◽  
Author(s):  
Silvia Mart�n ◽  
Pilar Arana ◽  
Nuno Henriques-Gil
Keyword(s):  
Mating Success ◽  
B Chromosomes ◽  
Eyprepocnemis Plorans
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