Download Biology of Amphibian Tumors by Merle Mizell (auth.), Merle Mizell (eds.) PDF

By Merle Mizell (auth.), Merle Mizell (eds.)

New Orleans has a unique background as a middle for scientific and organic studying, a heritage shared by means of Tulane collage, its college of medication, and its Bio­ logical and scientific Sciences departments. This historical past made it in particular becoming that the collage, together with the melanoma organization of better New Orleans, Inc. and the nationwide melanoma Institute, may still sponsor the "Symposium: Biology of Amphibian Tumors" held October 28, 29, 30, 1968. The college needs to specific its appreciation to the melanoma organization for its information in making the Symposium attainable and to recognize the aid made to be had in the course of the Bio­ clinical Sciences aid furnish software of the nationwide Institutes of well-being. because the identify of this quantity shows, the Symposium yielded important leads to the world of melanoma learn and it stands to stimulate extra efforts during this most vital box. a few proposal of the effect of this symposium is advised by means of the large variety of the two hundred contributors it attracted. They got here not just from the breadth and size of the united states, yet from in a foreign country, from France, England, Austria, and Italy.

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Ral1a pipiel1s seems to have a diversity of interpopulational relations that, when studied further, should throw much light on the relation between evolutionary divergence and systematic position. References 1. CLAUSEN, JENS: Stages in the evolution of plant species. Ithaca: Cornell University Press, 19 51. 2. COPE, E. : The Batrachia of North America. Bulletin of the United States National Museum 34:397-406,1889. 3. : The status of the leopard frogs, Raila brachycepbala and Rana pipiells. Herpetologica 1:84-87, 1937.

Incipient intraspecific isolating mechanisms in RaIla Pipicl1S. Genetics 31:304-326,1946. 10. : Hybridization between Raila PiPiclls from Vermont and eastern Mexico. Proceedings of the National Academy of Sciences 33:72-75, 1947. 34 JOHN A. MOORE 11. : Further studies on Raila pipiens racial hybrids. American Naturalist 84:247-254,1950. 12. : Diploid and haploid interracial hybrids in RaIla Pipims. Genetics Today. Proceedings of the XI International Congress of Genetics 2:431-436, 1964. 13. : Diploid and haploid hybridization of different populations of the Raila pipiens complex.

A reasonable solution to this problem cannot be expected until it becomes possible to state the problem more precisely. For example, one cannot expect "an adequate specification of the genetic difference between two closely related species . . " unless there is an adequate specification of specific and intraspecific categories. Then again, biologists have never agreed on what they have meant by genetic differences, genetic relatedness, etc. Usually some measure of total difference IS Implied though, of necessity, only a minute and unknown fraction of the total difference is actually dealt with.

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