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The quantitative evaluation of egg cleavage in frogs



The quantitative evaluation of egg cleavage in frogs



Vestnik Moskovskogo Universiteta Seriya XVI Biologiya (1): 47-58



The unequality of 1-4th divisions in normally cleaving frog's egg has been demonstrated by method of the sedimentation at the unit gravity. The relative masses of corresponding by ranks blastomeres were found similar in different 4-, 8- and 16-cells embryos obtained from different parties of spawn. Every possible as well as more probable variants of the genesis and topologies of diversed by masses blastomeres in 40 and 8-cells embryos have been shown. The superposition of the known fate map of amphibian embryos on the more probable topological scheme of the 8-cells embryo has shown the difference as well as the limitation of the prospective potentions of the diversed by masses blastomeres. The author concludes that the blastomeres' sizes are not only markers used to retrace the spatial distribution of blastomeres and its temporal alteration, but are the essential quality of system too, resulting in the primary segregative structure of the zygote and determining the cellular variety in course of following development.

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