Titlebook: Gene Interactions in Development; L. I. Korochkin,A. Grossman Book 1981 Springer-Verlag Berlin ? Heidelberg 1981 Embryo.Interactions.Molek

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0341-5376 for the English edition, to reflect progress in molecular developmental genetics. Recent important findings in this field have brought about essential corrections to the concept of genetic regulation of the process of cell differentiation. The discovery of the mosaic structure of a gene prompted the

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Economy and Society in the Western Zhou,nism depends on all of the genes in the genome in general, although this dependence of some of them is not noticeable (Astaurov, 1968). This means that the development of each trait is due to a number of successive gene interactions, acting in specific conditions (Rokitsky, 1929).

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Functional-Genetic Mosaicism in Cell Populationhe developing organism on other parts which, as a result, go through part of their development under specific conditions.” Ha- dorn (1965) characterized determination as a “process, the result of which allows a competent cell to choose one from many developmental pathways”.

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Genetic Heterogeneity and the Establishment of Tissue Systems During Developmentwas demonstrated that the acquired competence of the dissociated cells of the presumptive ectoderm is correlated with the altered sensitivity to the inductor (see review Ignatijeva, 1967). It should be noted that there is a significant loss of cells during morphogenetic processes, and, therefore, a