Late DNA replication pattern in sex chromosomes of Melandrium.

@article{Choudhuri1969LateDR,
  title={Late DNA replication pattern in sex chromosomes of Melandrium.},
  author={H. C. Choudhuri},
  journal={Canadian journal of genetics and cytology. Journal canadien de genetique et de cytologie},
  year={1969},
  volume={11 1},
  pages={
          192-8
        }
}
  • H. C. Choudhuri
  • Published 1969
  • Biology, Medicine
  • Canadian journal of genetics and cytology. Journal canadien de genetique et de cytologie
DNA replication patterns in somatic cells of female and male Meladrium album were studied with autoradiographic methods. The S-period and the average generation time have been estimated to be 5.7 and 15.5 hours respectively. The heterochromatin observed in interphase nuclei may represent the late replicating and presumably inactivated sex chromosome.One arm of one X chromosome is late replicating in females. In the Y chromosome a region near the centromere replicates late in the S-period. The… Expand
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References

SHOWING 1-5 OF 5 REFERENCES
Differential Uptake of Tritiated Thymidine into Hetero- and Euchromatin in Melanoplus and Secale
  • A. Lima-de-faria
  • Biology, Medicine
  • The Journal of biophysical and biochemical cytology
  • 1959
TLDR
In rye the asynchrony of synthesis occurs within each chromosome, and in this species during early prophase of meiosis the sex chromosome forms a heterochromatic block large enough to be resolved in tritium autoradiographs. Expand
Gene Action in the X-chromosome of the Mouse (Mus musculus L.)
TLDR
Ohno and Hauschka1 showed that in female mice one chromosome of mammary carcinoma cells and of normal diploid cells of the ovary, mammary gland and liver was heteropyKnotic and suggested that the so-called sex chromatin was composed of one heteropyknotic X-chromosome. Expand
Incorporation of Tritiated Thymidine into Meiotic Chromosomes
In pachytene nuclei of Melanoplus the heterochromatin of the sex chromosome was found to synthesize DNA at a different time than the autosomal euchromatin.
A Morphological Distinction between Neurones of the Male and Female, and the Behaviour of the Nucleolar Satellite during Accelerated Nucleoprotein Synthesis
TLDR
It appears not to be generally known that the sex of a somatic cell as highly differentiated as a neurone may be detected with no more elaborate equipment than a compound microscope following staining of the tissue by the routine Nissl method. Expand