By Ernst Mayr (auth.), Kurt Benirschke (eds.)
Ten years in the past a symposium on Cytotaxonomy 'was held in London (Proc. Linn. Soc. Lond. 169:110, 1958) during which a primary try out was once made to collect a number of disciplines to debate advances of mammalian cytogenetics and to place them into right context with the sciences of evolution and taxonomy. The introductory comments by means of \V. B. Turrill to that symposium, basically an admonishment to be tolerant of the fast comings of our respective disciplines, will be a wonderful commence ning to this convention as ,,'ell. despite the fact that, the assembly held at Hanover was once conceived extra alongside the strains of feedback made via R. B. Seymour Se,,'ell in his presidential deal with to an identical society: "It has been acknowledged that scientists during this look for fact are these days an excessive amount of excited about the buildup of evidence, and make too little use in their imagina tion of their makes an attempt to provide an explanation for such evidence as they've got accrued. " (In "The continental go with the flow idea and the distribution of the Copepoda," ibid. 166:149, 1956. ) \\Tith this as a heritage, years in the past we held the 1st of a sequence of loosely-structured meetings on reproductive failure within the enjoyable surroundings of this small New England collage neighborhood. The manu scripts of that assembly were released (Comparative features of Re efficient Failure, Springer-Verlag long island Inc. , 1967).
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Extra info for Comparative Mammalian Cytogenetics: An International Conference at Dartmouth Medical School Hanover, New Hampshire, July 29—August 2, 1968
They are said to have XY I Y2/XX scheme of sex-determining mechanism, whereas, in fact, they have not invented a new sex-determining mechanism. Their X is a combination of one whole X and one whole autosome, and their Y2 is an intact autosome homologous to the autosomal part of the X_ The YI is the original Y. The important fact is that even these species have preserved the original X-linkage in its entirety. Accordingly, only the original X-part in female somatic cells becomes heterochromatinized, and the autosomal part behaves like any other autosome (Hayman and Martin, 1965).
Mathai, C. , S. Ohno and E. Beutler: Sex-linkage of the glucose-6-phosphate dehydrogenase gene in the family Equidae. Nature 210:115, 1966. : La formule chromosomique et Ie probleme de la determination sexuelle chez Ellobius lutescens Thomas. Rodentia-Muridae-Microtinae. Arch. Klaus-Stift. -Forsch. 28:65, 1953. McKusick, V. : On the X-chromosome of man. Quart. Rev. Bioi. 37:69, 1962. Migeon, B. , V. M. Der Kaloustian, W. L. Nyhan, W. J. Young and B. , H. C. Roswell, G_ A. Robinson, T. D. Hoeksema and H.
However, by this time, at least two acrocentrics were already linked together into one chromosome which was the original X-linkage group. For this reason, the diploid chromosome number of this primordial mammal could not have been higher than 94. The known highest chromosome number among placentals is 84 which is not too far off this expectation. Successive Robertsonian translocations (centric fusions), interspersed by pericentric inversions, appear to have reduced the diploid chromosome number of a majority of mammals to the range of 44-48, and in many instances still further to lower numbers.
Comparative Mammalian Cytogenetics: An International Conference at Dartmouth Medical School Hanover, New Hampshire, July 29—August 2, 1968 by Ernst Mayr (auth.), Kurt Benirschke (eds.)