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Neeru Neeru Anita Bhatnagar Abhay Singh Yadav

Abstract

Cytogenetic survey of fishes becomes increasingly important to establish chromosomal relation between the teleosts, to have a glimpse of the relation between chromosomal evolution and differentiation of vertebrate species. In the present study, Chromosome banding studies was done in three species of carps i.e. Catla catla (Hamilton, 1822), Labeo rohita (Hamilton, 1822) and Cirrhinus mrigala (Hamilton, 1822). Diploid chromosome number 50 was observed in all 3 species of carps. The chromosomes of C. catla, L. rohita and C. mrigala showed constitutive heterochromatin at telomeric and centromeric regions of chromosomes. The Ag-NOR (Argyrophilic-Nucleolus Organizer Region) bands were observed on homologous chromosome pair number 11 in C. catla, 15th chromosome pair in L. rohita. In C. mrigala, the Ag- NOR staining elucidated the presence of darkly stained NORs on the terminal region of the long arms of one of the chromosome. Another homologue of this chromosome pair could not be localized due to scattering of chromosomes. The results depict that variation in ecological conditions with time due to human activities can not only affect the chromosomal number but also chromosomal morphology.


 

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Keywords

Catla catla, Labeo rohita, Cirrhinus mrigala, Chromosomes, Heterochromatin

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Neeru, N., Bhatnagar, A., & Yadav, A. (2018). A study of constitutive heterochromatin and NOR banding in three species of Indian major carps from the State of Haryana, India. Journal of Applied and Natural Science, 10(2), 535-539. https://doi.org/10.31018/jans.v10i2.1731
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