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By Taubes C.H.

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Extra resources for An introduction to bundles, connections, metrics and curvature

Sample text

Regulation would be due to the intervention of an entelechy, a principle which, by definition, cannot be studied experimentally. Today, embryologists are trying to understand the molecular basis of regulation without calling on entelechies and other vital forces for an explanation. In mosaic eggs, like that of the mollusk Ilyanassa, removing part of the cytoplasm results in the formation of abnormal embryos, which have some parts missing. For instance, removing the polar lobe (which is purely cytoplasmic and never contains a nucleus) at the "trefoil stage" leads to a defective organism.

Driesch). a Normal development leading to the formation of a pluteus larva. b The separation of the two first blastomeres leads to the formation of two smaller, but normal plutei into a UV-irradiated egg allows the formation of normal ovaries or testes. The nature of the active material is not known, but its strong UV-sensitivity indicates that nucleic acid is an essential factor. In other insects (Cecidyomidae), the nuclei which, during cleavage, reach the germ plasm, retain their chromosomes in the usual way during mitosis; in the other parts of the same eggs, a loss of chromosomes is observed.

Morgan realized that cytoplasmic heterogeneity, which is so important in the very early stages of embryonic development, might exercise an effect on genetic activity. He suggested, in 1934, that identical nuclei are distributed in a heterogeneous cytoplasm during the cleavage period which follows the fertilization of the egg. As a result, genes would become active in certain parts of the embryo and not in others. Under the impulse of the activated genes, the cytoplasm would become still more different in the various parts of the embryo.

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An introduction to bundles, connections, metrics and curvature by Taubes C.H.


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