Evolution of karyotypes in snakes

@article{Singh2004EvolutionOK,
  title={Evolution of karyotypes in snakes},
  author={Lalji Singh},
  journal={Chromosoma},
  year={2004},
  volume={38},
  pages={185-236}
}
  • L. Singh
  • Published 2004
  • Biology, Medicine
  • Chromosoma
Karyotype analysis and morphometric measurement of the chromosomes of 17 species of snakes have been done. Chromosomes of different species so far worked out in each family have been compared using quantitative methods to derive chromosomal affinities between species of different taxonomic categories. The following conclusions have been drawn: (i) It is suggested that the retention of Xenopeltidae as a separate family is unnecessary and the only species Xenopeltis unicolor referred to in that… Expand
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It seems safe to accept the generalization that a species can only be defined by a whole array of morphological, physiological and behavioral features and, of course, of those features pertinent toExpand
Morphometrische Karyotypanalyse Einiger Schalangen-Arten
TLDR
It has been shown cytologically that in several snake genera the female is the heterogametic sex, however, hydrolysed nuclei of erythrocytes and other interphase nuclei often contain a dark staining body not unlike the sex chromatin of mammals. Expand
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  • Biology, Medicine
  • Annals of the New York Academy of Sciences
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Some of the cytological evidence is presented which, it is hoped, can provide additional criteria for an elucidation of the relation and evolution of Primates. Expand
A comparative study of the chromosomes of birds
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The unequivocal identification of W chromosome in the females of five species of the present investigation further strengthens the generalisation that, at least in Carinatae, the sex chromosome constitutions are of ZZ and ZW types in males and females respectively. Expand
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TLDR
The close cytological kinship between snakes and birds was revealed; both are almost identical in total genetic content, which is about 50 per cent that of placental mammals, as well as Z-chromosomes very similar in absolute size. Expand
Evolution of sex-chromosomes and formation of W-chromatin in snakes
TLDR
The analysis of sex-chromosome complexes and formation of W-chromatin in 16 species of snakes of the families Boidae, Colubridae, Elapidae, and Hydrophiidae suggests that the W- chromatin is responsible for the synthesis of the nucleolus in these snakes. Expand
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Evidence from this study of the chromosomes supports other lines of evidence which suggest that the subgenus Spermophilus contains two species groups, one composed of S. townsendi and S. washingtoni and the second consisting of S . Expand
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TLDR
The chromosomes of ten species of reptiles were investigated in male germ cells through spermatogenesis, with special regard to the karyotype, to say that the chromosomal relation of reptiles is on the whole closely related within the genus, but it seems not the same with the family. Expand
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TLDR
The importance of reptilian cytological investigation prompted us to use short term culture techniques for cytogenetical studies in snakes with good results. Expand
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TLDR
The diploid chromosome number in the males of this species is 46 and the fundamental chromosome number is also the same, so possibility of the occurrence of M-A+A type of process is discussed. Expand
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