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Quarterly Journal of Microscopical Science, Vol s2-79, 57-72, Copyright © 1936 by Company of Biologists

Memoirs: Cleavage of Blastomeres in the Absence of Nuclei

F. GROSS 1

1 Kaiser Wilhelm Institut für Biologie, Berlin-Dahlem, Abt. M. Hartmann, and Galton Laboratory, University College, London

After exposure to low temperature, at the metaphase stage of the first meiotic division, parthenogenetic eggs of Artemia salina may show abnormal cleavage resulting in blastulae with a very big nucleus in only one blastomere. The rest of the blastomeres contain cytasters alone which are apparently sufficient to determine cell division. In shape and arrangement around the cleavage cavity they look very like those of normal blastulae.

If the oocytes are fixed immediately after the exposure to low temperature they show, in some cases, a number of cytasters scattered near the surface, although the meiotic division has not yet taken place. It is suggested that the cytasters originated from the ectoplasmic layer, and that their formation and division is independent of nuclear divisions.






© The Company of Biologists Ltd 1936