Chromosome banding in Amphibia. XV. Two types of Y chromosomes and heterochromatin hypervariabilty inGastrotheca pseustes (Anura,Hylidae) |
| |
Authors: | M Schmid C Steinlein R Friedl C G de Almeida T Haaf D M Hillis W E Duellman |
| |
Institution: | (1) Department of Human Genetics, University of Würzburg, Koellikerstrasse 2, D-8700 Würzburg, Federal Republic of Germany;(2) Texas Agricultural Experiment Station, Texas A & M University, 78596-8399 Weslaco, TX, USA;(3) Department of Genetics, Stanford University School of Medicine, 94305 Stanford, CA, USA;(4) Department of Zoology, University of Texas, 78712-1064 Austin, TX, USA;(5) Museum of Natural History, University of Kansas, 66045-2454 Lawrence, KS, USA |
| |
Abstract: | The chromosomes of the newly discovered South American marsupial frogGastrotheca pseustes were analyzed by conventional methods and by various banding techniques. This species is characterized by XY/XX sex chromosomes and the existence of two different morphs of Y chromosomes. Whereas in type A males the XYA chromosomes are still homomorphic, in type B males the YB chromosome displays a large heterochromatic region at the long arm telomere which is absent in the X. In male meiosis, the homomorphic XYA chromosomes exhibit the same pairing configuration as the autosomal bivalents. On the other hand, the heteromorphic XYB chromosomes form a sex bivalent by pairing their short arm telomeres in a characteristic end-to-end arrangement. Analysis of the karyotypes by C-banding and DNA base pair-specific fluorochromes reveals enormous interindividual size variability of the autosomal heterochromatin. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|