Unusually large sex chromosomes in the sitatunga (Tragelaphus spekei) and the blackbuck (Antilope cervicapra)

  title={Unusually large sex chromosomes in the sitatunga (Tragelaphus spekei) and the blackbuck (Antilope cervicapra)},
  author={Doris H. Wurster and Kurt Benirschke and H. Noelke},
Sex chromosomes in mammals are generally of the XY type with the X chromosome constituting 5% by weight of the haploid chromosomal complement. Unusually large sex chromosomes have been described in a few species all of which belong to theRodentia, but two members of theArtiodactyla, the African sitatunga and the Indian blackbuck, have now been found to have this peculiarity. The sitatunga has an X chromosome that represents 13.08% and a Y that represents 7.29% of the haploid complement, and the… 
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The point is stressed that the problem of the existence of homologous sections of the X and Y chromosomes in man cannot be solved by present cytological observations in the absence of genetical evidence.
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The pattern of inactivation of this huge X is such that in each diploid nucleus of both sexes, the amount of euchromatic X-chromosome material is the same as it is in the majority of placental mammals in which the X comprises about five per cent of the haploid set.
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The chiasmatic association of the heteromorphic sex chromosomes in the spermatocytes of the Chinese hamster was observed in squash and/or air-dried preparations and suggested that the distal segment of the long arm of the X is homologous to the short arm ofThe Y.
Relationship between large Y-chromosome and side-by-side pairing of the XY-bivalent observed in the chinese hamster, Cricetus griseus
Matthey believes that the large Y seen in many species of Eurasian Cricetinae results from a translocation involving a small Y, a large X, and a homologous pair of autosomes, which explains the present observations on the Chinese hamster.
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Das Moment des Statischen schien, falls man aus den Erfahrungstatsachen aufs Ganze schliel3en wollte, aus der Welt fiberhaupt ffir immer verbannt zu sein and nur noch zeitlich ver~inderliche (allenfalls periodische) L6sungen in Frage zu kommen.
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  • Biology, Medicine
    Annales de genetique
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BEpAK : Xautosome ratio and the betmvior pattern of individual Xchromosomes in placental mammals
  • Chromosoma ( Berl . )
  • 1965
WEILE ~ : Relationship between large Y - chromosome and sidebyside pairing of the XYbivalent observed in the Chinese hamster , Cricetulus griseus
  • Chromosoma ( Berl . )
  • 1964