Download e-book for iPad: An Outline of Developmental Physiology by Chr. P. Raven and G. Kerkut (Auth.)

By Chr. P. Raven and G. Kerkut (Auth.)

ISBN-10: 0080113435

ISBN-13: 9780080113432

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Other sub­ stances, such as sodium thiocyanate, have the opposite effect; they reinforce the animal gradient at the expense of the vegetative gradient so that the animal differentiation of the embryo is promoted, and its vegetative differentiation inhibited. If the polarity of the egg is determined by axial gradients, disturbance of these gradient systems may be expected to cause changes in polarity. We have mentioned above (p. 34) that the structure of the egg can be profoundly modified by centrifuging.

Done the same experiment in newts. After removal of the envelopes, newt eggs at the two-cell stage often assume a dumb-bell shape. When one was placed crosswise on top of the other, two of these dumb-bells often fused into one single germ. Each pair of opposite quadrants of such an embryo was derived from one of the original eggs. Part of the products of these fusions proved to be able to develop into single, more or less har­ moniously built embryos. This was possible even when the fused eggs belonged to different species of newts so that the resulting embryo was a "chimera", consisting of quadrants which alternately belonged to either of the two species (Plate II).

43). This may be called a yolk gradient. Further, Child and his collaborators have for many years stressed the importance of local differences in the in­ tensity of metabolism, as expressed in differential sensitivity to noxious influences in different regions. In animal eggs, as a rule, the sensitivity is greatest at the animal pole, and from there it decreases gradually in the direction of the vegetative pole. This points to a variation in metabolism of the egg along its main axis. Similar results have been obtained in determin­ ations of the redox potential (rH) of the egg cytoplasm with various dyes, such as Janus green and methylene blue (Ries and Gersch, 1936).

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An Outline of Developmental Physiology by Chr. P. Raven and G. Kerkut (Auth.)

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