Chromosome Study of the Common Mole Rat (Tachyoryctes splendens) from Different Localities in Ethiopia
| dc.contributor.advisor | Dagne, Kifle (PhD) | |
| dc.contributor.author | Mihretie, Ziyin | |
| dc.date.accessioned | 2018-07-18T08:51:49Z | |
| dc.date.accessioned | 2023-11-09T04:20:53Z | |
| dc.date.available | 2018-07-18T08:51:49Z | |
| dc.date.available | 2023-11-09T04:20:53Z | |
| dc.date.issued | 2005-06 | |
| dc.description.abstract | The common mole rat, Tachyoryctes splendens, belongs to family Rhizomyidae or Muridae (Mammalia; Rodentia). Somatic chromosomes of the species were studied from 9 localities in Ethiopia (Mugo, Masha, Bure, Ziway, Asebe Teferi, Alemaya, Entoto, Sebeta and Debre Sina) using the standard Giemsa staining and C-banding techniques. Six different karyotypic forms were found. These variations were revealed as differences in chromosome morphology, autosomal fundamental number, amount and distribution of heterochromatin. However, there was no variation in diploid chromosome number and specimens from all the localities had 2n=48. The six karyotypic forms had the following karyotypic formulae: Mugo, Masha and Bure (12m + 10st + 26a), Debre Sina (10m + 8st + 30a), Ziway (8m + 12st + 28a), Asebe Teferi (8m + 4st + 36a), Alemaya (8m + 6st + 34a), and Entoto and Sebeta (7m + 1 sm + 2st + 38a). C-banding revealed that, in addition to the Y-chromosome (except in Entoto), 12, 12, 36, 4, 6, 4, 4 autosomes in Mugo, Masha, Ziway, Asebe Teferi, Alemaya, Entoto and Sebeta were C-positives, respectively. The telomeric region of the long arm of the X-chromosome was also C-positive in animals from Entoto and Sebeta. The present study did not confirm the earlier suggestions that the number of biarmed chromosomes of T. splendens decreases with the increase in aridity and the number of heterochromatic arms may exhibit an altitude gradient. We recommend further studies like Gbanding, zoogeographical, physiological and hybridization studies on T. splendens from different parts of the distribution range of the species so that the results could supply information to reveal factors associated with the existing variations, and to draw a valid conclusion that could be used in clearing the taxonomic uncertainties in this animal. Key words/ Phrases: Tachyoryctes splendens, chromosome, karyotype, C-banding, Ethiopia | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/123456789/9239 | |
| dc.language.iso | en | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | Tachyoryctes splendens | en_US |
| dc.subject | chromosome, karyotype | en_US |
| dc.subject | C-banding, Ethiopia | en_US |
| dc.title | Chromosome Study of the Common Mole Rat (Tachyoryctes splendens) from Different Localities in Ethiopia | en_US |
| dc.type | Thesis | en_US |