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The Development of Asymmetry

Morgan, T. H. (1924) The Development of Asymmetry. Scientific Monthly, 18 (3). pp. 273-290. ISSN 0096-3771.

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It has been shown that the median plane of symmetry of the embryo, when not impressed on the egg by its stiff enveloping membrane, may in certain cases be traced back to another external agent, such as the path of entrance of the spermatozoon, or possibly, in one case, to pressure acting on the egg in the oviduct. It was not found necessary, therefore, to assume that a bilateral structure is present in the protoplasm of the unfertilized egg, as long as its origin could be explained as arising from extraneous sources. There is another group of cases in which structures that are asymmetrical develop. It is as important to discover the origin of asymmetry as to find out how a bilateral symmetry arises in the egg, and the situation is all the more interesting because the asymmetry is generally imposed on forms that have a fundamental, structural bilaterality.

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Additional Information:© 1924 American Association for the Advancement of Science.
Issue or Number:3
Record Number:CaltechAUTHORS:20141216-095146849
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Official Citation:The Development of Asymmetry T. H. Morgan The Scientific Monthly, Vol. 18, No. 3 (Mar., 1924), pp. 273-290 Published by: American Association for the Advancement of Science Article Stable URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:52852
Deposited By: George Porter
Deposited On:16 Dec 2014 17:59
Last Modified:03 Oct 2019 07:44

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