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On the evolution of sex determination
- D. Nakamura, S. Wachtel, V. Lance, W. Beçak
- Biology, Medicine
- Proceedings of the Royal Society of London…
- 23 November 1987
Female mice reject skin grafts from intrastrain males because of the H-Y transplantation antigen. Those females produce antibodies that recognize a male-specific cell-surface antigen in serological… Expand
Xenopus laevis Daudin
The pair of large acrocentric autosomes bears a secondary constriction and satellites on the short arm.
X-autosome ratio and the behavior pattern of individual X-chromosomes in placental mammals
SummaryFrom the 15 diverse species of placental mammals investigated cytologically in this laboratory, seven species and one interspecific hybrid were selected for the present study : man (Homo… Expand
Cytotaxonomy and chromosomal evolution in Serpentes.
The karyotypes of 15 species of snakes are described: Lachesis muta noctivaga , Micrurus lemniscatus carvalhoi , Philodryas aestivus aestivus , &l
Polyploidy and mechanisms of karyotypic diversification in Amphibia.
Polyploid species were described in amphibians of the family Ceratophrydidae (Procoela). Tetraploid (4N = 44) and octoploid (8N = 104) karyotypes resulted apparently by duplication of ancestral genome
Close karyological kinship between the reptilian suborder serpentes and the class aves
SummaryIn contrast to the situation found in two classes of warm-blooded vertebrates, mammals and birds, the class Reptilia is not uniform with regard to total genetic content; rather, it contains… Expand
Cytological evidence of constant tetraploidy in the bisexual South American frog Odontophrynus americanus
Odontophrynus americanus has 2n=44 chromosomes in somatic and gonad cells which can be ordered in 11 groups of homologues. In spermatocytes I they form mostly ring quadrivalents. In metaphase II 22… Expand
Chromosome Polymorphism, Geographical Variation and Karyotypes in Sauria
SUMMARYA comparative cytogenetic study was done on ten lacertilian species belonging to six families: Iguanidae, Teiidae, Amphisbaenidae, Gekkonidae, Anguidae and Scincidae.Intra-individual and… Expand
Nucleolar organizer regions and constitutive heterochromatin in polyploid species of the genus Odontophrynus (Amphibia, Anura).
Chromosome banding patterns obtained by ammoniacal silver staining (Ag-AS) and alkaline Giemsa (CBG) have been analysed in several amphibian species of the genus Odontophrynus from South America.… Expand
Bovine papillomavirus transmission and chromosomal aberrations: an experimental model.
- R. C. Stocco dos Santos, C. J. Lindsey, +6 authors W. Beçak
- Biology, Medicine
- The Journal of general virology
- 1 September 1998
Enzootic haematuria and urinary bladder cancer in cattle are associated with feeding on bracken fern and bovine papillomavirus (BPV) infection. An increased rate of chromosomal aberrations in… Expand