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Vol. 11, No. 4, 1972
Issue release date: 1972
Section title: Paper
Cytogenetics 1972;11:270–278
(DOI:10.1159/000130197)

Karyotype analysis of Xenopus muelleri (Peters) and Xenopus laevis(Daudin), Pipidae

Tymowska J. · Kobel H.R.
Station de Zoologie Expérimentale, University of Geneva, Geneva

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Article / Publication Details

First-Page Preview
Abstract of Paper

Accepted: 4/27/1972
Published online: 4/30/2008

Number of Print Pages: 9
Number of Figures: 0
Number of Tables: 0

ISSN: 1424-8581 (Print)
eISSN: 1424-859X (Online)

For additional information: http://www.karger.com/CGR

Abstract

A cytogenetic analysis of two anuran species, Xenopus laevis laevis and Xenopus muelleri, was performed. The diploid number of chromosomes in both species was 2n = 36. The two karyotypes, arranged according to size of chromosome and centromere position, showed no pronounced differences. However, the chromosomes which had a secondary constriction were different. In X. laevis this constriction (nucleolar organizer) was found on one pair of acrocentric chromosomes only, the pair showing association in about 50% of the metaphases. In X. muelleri, on the other hand, two distinct pairs of submetacentric chromosomes contained secondary constrictions. Neither of these two chromosome pairs was morphologically similar to the constriction-bearing chromosomes of X. laevis. Association similar to that in X. laevis was found in one pair only, the one with a terminal constriction. In neither of the two species was there any evidence of sex-chromosome heteromorphism.


  

Author Contacts

Request reprints from: Mrs. Janina Tymowska, Station de Zoologie Expérimentale, 154, route de Malagnou, 1224-Geneva (Switzerland).

  

Article Information

Manuscript received: 27 April 1972
Published online: April 30, 2008
Number of Print Pages : 9

  

Publication Details

Cytogenetic and Genome Research

Vol. 11, No. 4, Year 1972 (Cover Date: 1972)

Journal Editor: Schmid M. (Würzburg)
ISSN: 1424–8581 (Print), eISSN: 1424–859X (Online)

For additional information: http://www.karger.com/CGR


Article / Publication Details

First-Page Preview
Abstract of Paper

Accepted: 4/27/1972
Published online: 4/30/2008

Number of Print Pages: 9
Number of Figures: 0
Number of Tables: 0

ISSN: 1424-8581 (Print)
eISSN: 1424-859X (Online)

For additional information: http://www.karger.com/CGR


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Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in goverment regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug.
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