Abstract
PAINTER1 and Schrader2 have recently suggested that the long chromosomes of the germ-line cells in Ascaris megalocephala are peculiar in having a large number of spindle attachments instead of only one as hitherto assumed. Some time ago, I carried out an experiment to test this hypothesis. Uteri of adult females (var. bivalens) were irradiated with a Coolidge tube (65 kv., 5 ma., 30 cm. distance, unscreened radiation for 5 minutes). They were then kept for 5½ days at 38° C. and fixed in Carnoy. In several cases the long chromosomes of the first cleavage division were fragmented as a result of the irradiation. Fig. 1 shows a cell in which one of the four chromosomes has been broken in two places, leaving three fragments which are all attached to the spindle.
Similar content being viewed by others
Article PDF
References
T. S. Painter, ” Chromosome Fusion and Speciation in Droiophila”, Genetics, 20, 327 (1935).
P. Schrader, ” Notes on the Behaviour of Long Chromosomes”. Cytologia, 6, 422 (1935).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
WHITE, M. Chromosome Cycle of Ascaris megalocephala. Nature 137, 783 (1936). https://doi.org/10.1038/137783a0
Issue Date:
DOI: https://doi.org/10.1038/137783a0
This article is cited by
-
The kinetochores of Caenorhabditis elegans
Chromosoma (1982)
-
Die Blastomerendifferenzierung f�r Soma und Keimbahn beiParascaris equorum
Wilhelm Roux' Archiv f�r Entwicklungsmechanik der Organismen (1967)
-
Die Blastomerendifferenzierung f�r Soma und Keimbahn beiParascaris equorum
Wilhelm Roux' Archiv f�r Entwicklungsmechanik der Organismen (1967)
-
The chromosomes of zooparasites
Chromosoma (1957)
-
The chromosomal cycle in parascaris equorum (Ascaris megalocephala): Oogenesis and diminution
Chromosoma (1953)
Comments
By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.