Abstract
Two kinds of supernumerary chromosome segments have been found on the megameric chromosome of the grasshopper Pyrgomorpha conica. One of them is euchromatic and distally located while the other one is heterochromatic and proximally located. Their effects on chiasma distribution in heterozygous, homozygous and doubly heterozygous bivalents for these segments have been analyzed. Both segments distort chiasma distribution so that the single chiasma is preferentially formed far from the location of each supernumerary segment. This effect is more pronounced in bivalents that are homozygous for the presence of the proximal heterochromatic segment. In doubly heterozygous bivalents that possess both segments on the same chromosome the chiasma distribution is significantly different from that observed in heterozygous bivalents for each segment and a significant frequency of univalents was scored.
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Cabrero, J, Navas-Castillo, J, and Camacho, J P M. 1986. Effects of supernumerary chromosome segments on the activity of nucleolar organiser regions in the grasshopper Chorthippus binotatus. Chromosoma, 93, 375–380.
Camacho, J P M, Viseras, E, Navas, J, and Cabrero, J. 1984. C-Heterochromatin content of supernumerary chromosome segments of grasshoppers: detection of a euchromatic extra segment. Heredity, 53, 167–175.
Garcia-Lafuente, R, Lopez-Fernandez, C, and Gosalvez, J. 1983. Extra heterochromatin in natural populations of Gomphocerus sibiricus (Orthoptera: Acrididae). 2. Chiasma distribution in the M7 bivalent. Cytobios, 37, 149–155.
Gosalvez, J, Bella, J L, Lopez-Fernandez, C, and Mezzanotte, R. 1987. Correlation between constitutive heterochromatin and restriction enzyme resistant chromatin in Arcyptera tomosi (Orthoptera). Heredity, 59, 173–180.
Hewitt, G M. 1979. Animal Cytogenetics, vol 3: Insecta 1 Grasshoppers and Crickets. Gebrüder Borntraeger, Berlin-Stuttgart.
John, B. 1973. The cytogenetic systems of grasshoppers and locusts. II. The origin and evolution of supernumerary segments. Chromosoma, 44, 123–146.
John, B. 1981. Heterochromatin variation in natural populations. In: Bennett, M. D., Bobrow, M. and Hewitt, G. M. (eds) Chromosomes Today, vol. 7, pp. 128–137. George Allen and Unwin, London.
John, B, and King, M. 1985. The inter-relationship between heterochromatin distribution and chiasma distribution. Genetica, 66, 183–194.
John, B, King, M, Schweizer, D, and Mendelak, M. 1985. Equilocality of heterochromatin distribution and heterochromatin heterogeneity in acridid grasshoppers. Chromosoma, 91, 185–200.
Miklos, G L G, and Nankivell, N. 1976. Telomeric satellite DNA functions in regulating recombination. Chromosoma, 56, 143–167.
Moens, P B, Bernelot-Moens, C, and Spyropoulos, B. 1989. Chromosome core attachment to the meiotic nuclear envelope regulates synapsis in Chloealtis (Orthoptera). Genome, 32, 601–610.
Navas-Castillo, J, Cabrero, J, and Camacho, J P M. 1985. Chiasma redistribution in bivalents carrying supernumerary chromosome segments in grasshoppers. Heredity, 55, 245–248.
Rodriguez Iñigo, E, Bella, J L, and Garcia De La Vega, C. 1993. Heterochromatin differentiation between two species of the genus Dociostaurus (Orthoptera: Acrididae). Heredity, 70, 458–465.
Rufas, J S, Suja, J A, and Garcia De La Vega, C. 1986. Generation by a polymorphic supernumerary segment of recombination in a normally achiasmate proximal region in Acrotylus insubricus (Scopoli) (Orthoptera: Acrididae). Can J Genet Cytol, 28, 433–438.
Ruiz Rejon, C, and Ruiz Rejon, M. 1985. Chromosomal polymorphism for a heterochromatic supernumerary segment in a natural population of Tulipa australis Link (Liliaceae). Can J Genet Cyto, 27, 633–638.
Santos, J L, Del Cerro, A, Fernandez, A, and Diez, M. 1993. The relationship between synapsis and chiasma distribution in grasshopper bivalents heterozygous for supernumerary segments. Heredity, 70, 135–141.
Sentis, C, Santos, J, and Fernandez-Piqueras, J. 1989. Breaking up the chromosomes of Baetica ustulata by in situ treatments with restriction endonucleases. Genome, 32, 208–215.
Torre De La, J, Lopez-Fernandez, C, Nichols, R, and Gosalvez, J. 1986. Heterochromatin readjusting chiasma distribution in two species of the genus Arcyptera:the effects among individuals and populations. Heredity, 56, 177–184.
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Suja, J., Antonio, C., Garcia de la Vega, C. et al. Supernumerary chromosome segments and intrabivalent chiasma redistribution in Pyrgomorpha conica (Orthoptera). Heredity 73, 1–10 (1994). https://doi.org/10.1038/hdy.1994.92
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DOI: https://doi.org/10.1038/hdy.1994.92
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