Abstract
The present report is based on the karyotype studies of two species of fishes,Notopterus chitala andN. notopterus, collected from the river Jumna, Delhi, India. Both species possess a diploid number of 48 chromosomes, 12 of which are metacentric. The primary and secondary spermatocytes of one individual ofN. chitala have been found to possess varying numbers of univalent chromosomes. The possible origin and fate of the univalents are discussed.
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References
Darlington, C. D. (1931a). Cytological theory in relation to heredity.Nature,127: 709–712.
Darlington, C. D. (1931b). Meiosis.Biol. Rev.,6: 221–264.
Darlington, C. D. &A. Haque (1955). The timing of mitosis and meiosis inAllium ascolonicum.Heredity,9: 117–127.
Hughes-Schrader, S. (1943). Meiosis without chiasmata in diploid and tetraploid spermatocytes of the mantidCallimantis antillarum saussure.J. Morph.,73: 111–142.
Hughes-Schrader, S. (1950). The chromosomes of mantids (Orthoptera, Mantidae) in relation to taxonomy.Chromosoma,4: 1–55.
John, B. &S. A. Henderson (1962). Asynapsis and polyploidy inSchistocerca paranensis.Chromosoma,13: 111–147.
John, B. &B. Naylor (1961). Anomalous chromosome behaviour in the germ line ofSchistocerca gregaria.Heredity,16: 187–198.
Makino, S. (1941). A karyological study of gold fish of Japan.Cytologia,12: 96–111.
Nayyar, R. P. (1962). Karyotype studies in two cyprinids.Cytologia,27: 229–231.
Nayyar, R. P. (1964). Karyotype studies in seven species ofCyprinidae.Genetica,35: 95–104
Nogusa, A. (1960). A comparative study of the chromosomes in fishes with particular considerations on taxonomy and evolution.Mem. Hyogo Univ. Agri.,3 (1): 1–62.
Ohmachi, F. &N. Ueshima (1957). Variation of the chromosome complements inEuscirtus hemelytrus de Haan (Orthoptera, Grylloidea).Bull. Fac. Agri. Mie. Univ.,15: 1–13.
Smith, S. G. (1953). A pseudo-multiple sex-chromosome in an IndianGryllid.Chromosome,5: 555–573.
Srivastava, M. D. L. &U. Agrawal (1961). Absence of chiasmata and formation of complex chromosomal body in the spermatogenesis of the scorpionPalamnaeus longimanus.Caryologia,14: 63–77.
White, M. J. D. (1941). The evolution of sex chromosomes. II. The X-chromosome in theTettigonidae andAcrididae and the principle of evolutionary isolation of the X.J. Genet.,42: 173.
White, M. J. D. (1949). A cytological survey of wild populations ofTrimerotropis andCircotettix (Orthoptera, Acrididae). I. The chromosomes of twelve species.Genetics,34, 537–563.
White, M. J. D. (1951). Nucleus, chromosomes and genes. In: Cytology and Cell Physiology. Oxford Univ. Press, England.
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Nayyar, R.P. Karyotype studies in the genusNotopterus (Lacepede). the occurrence and fate of univalent chromosomes in spermatocytes ofN. Chitala . Genetica 36, 398–406 (1965). https://doi.org/10.1007/BF01557171
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DOI: https://doi.org/10.1007/BF01557171