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http://nopr.niscpr.res.in/handle/123456789/23316| Title: | Karyotype, Ag-NOR, CMA3 and SEM studies in a fish (Mystus tengara, Bagridae) with indication of female heterogamety |
| Authors: | Das, Jayanta Kumar Khuda-Bukhsh, A R |
| Keywords: | Chromomycin A3;Chromosome;Female heterogamety;Karyotype;Myslus tengara;Nuclear organizer region |
| Issue Date: | Jun-2003 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | Somatic karyotypes in M. tengara contained 54 chromosomes, comprising 26 homomorphic pairs in both sexes and one pair of heteromorphic nature in female (one big sub-metacentric and one small subtelocentric chromosomes), while in males this pair was homomorphic (with two big sub-metacentric chromosomes). The Nucleolus Organizer Regions (NORs) were located at one arm of the suspected sex elements in both sexes, while another pair of metacentric chromosomes (No.7) also showed Ag-positive arm. The CMA, technique revealed relatively bright fluorescing zones in the regions of chromosomes that showed Ag-positive staining, revealing thereby the preponderance of GC-rich active sites of rRNA genes in NORs. SEM studies revealed clear heteromorphism to exist in the elements suspected as sex chromosomes in females. |
| Page(s): | 603-608 |
| ISSN: | 0975-1009 (Online); 0019-5189 (Print) |
| Appears in Collections: | IJEB Vol.41(06) [June 2003] |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| IJEB 41(6) 603-608.pdf | 1.25 MB | Adobe PDF | View/Open |
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