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You are here: Home / Associated publications / Belgian Journal of Zoology / Bibliographic References / C-heterochromatin and chiasma terminalization in the jerboas Allactaga and Jaculus (Rodentia : Dipodidae)

ATM Ata and AAB Shahin (2006)

C-heterochromatin and chiasma terminalization in the jerboas Allactaga and Jaculus (Rodentia : Dipodidae)


C-heterochromatin and chiasma distribution patterns of meiotic chromosomes were studied in the dipodids Allactaga tetradactyla, Jaculus jaculus jaculus and Jaculus orientalis and chiasma terminalization was discussed. Darkly stained C-band located at the centromeric region of some bivalents was observed in all species at diakinesis and metaphase I. Of the occurrence of C-heterochromatin in the 24 bivalents, J. orientalis exhibited the highest percentage of absence of the C-blocks, where it was 68.8\%, compared to 18.8\% in A. tetradactyla and 14.6\% in J.j.jaculus. Analysis of variance of the means of relative distances of interstitial and terminal chiasmata from the centromere in the larger bivalents no. 1 and 2 of each species at diakinesis and metaphase I showed that the interstitial chiasmata are stable in their positions at the two stages and do not move to the chromosome termini, while the terminal chiasmata scored at diakinesis are in fact achiasmatic terminal associations and some of them gradually terminalize at metaphase I. Therefore, it is concluded that C-heterochromatin pattern of meiotic chromosomes is quite similar to that of mitotic chromosomes except the pair no. I in A. tetradactyla, stability of interstitial chiasmata at the two stages might negate the idea of chiasma terminalization and C-heterochromatin has not any role in the distribution of chiasmata.

C-heterochromatin; chiasma terminalization; Jerboas; Dipodidae; Allactaga tetradactyla; Jaculus spec
  • ISSN: 0777-6276

ISSN 2295-0451 (online version)
ISSN 0777-6279 (printed version)
impact factor 2015: 0,87.

Prof. Dr. Isa Schön
Royal Belgian Institute of Natural Sciences
Vautierstraat 29
1000 Brussels, Belgium


Annales de la Société malacologique de Belgique
​Annales de la Société royale malacologique et zoologique de Belgique
Annales de la Société Royale Zoologique de Belgique
Belgian Journal of Zoology