Nom du corpus

Corpus Systématique Animale

Titre du document

Chromosome replication in four species of snakes

Lien vers le document
Éditeur
Springer (journals)
Langue(s) du document
Anglais
Type de document
Research-article
Nom du fichier dans la ressource
Reptiles_v2b_00048
Auteur(s)
  • N. O. Bianchi 1,2
  • W. Beçak 1,2
  • Martha S. A. de Bianchi 1,2
  • Maria L. Beçak 1,2
  • Maria N. Rabello 1,2
Affiliation(s)
  • 1) Comisión de Investigación Científica de la Provincia de Buenos Aires, La Plata, Argentina
  • 2) Secção de Genética, Instituto Butantan, São Paulo, Brasil
Résumé

Chromosome measurements were performed in four species of snakes related at the level of suborder (Boa constrictor amarali, Xenodon merremii, Philodryas patagoniensis, Bothrops jararaca). The data obtained point out that pairs 1–3 were common to the four snakes and probably inherited from the ancestor of the suborder Serpentes. Pairs 5–8-W were characteristic of each snake; hence, it is possible to assume that they followed evolving after the appearing of the suborder Serpentes. Z-chromosomes were metacentric in B. constrictor amarali, X. merremii and B. jararaca and slightly submetacentric in P. patagoniensis. Area of these chromosomes varied from 8.6–10.6% of the haploid set in the four species studied.-The study of chromosome replication at the end of the S period points out that “shared chromosomes” have similar patterns of labeling. Therefore, it is proposed that the distribution of late replicating regions and heterochromatin in the genome is phylogenetically transmitted and probably genetically determined.—The analysis of the ending-sequence of chromosome replication shows that sex chromosomes finish earlier than macroautosomes. It is concluded that snakes probably have no mechanism of sex chromosome heterochromatinization in either sex. The absence of late replicating Z-chromosome in the males, favours the hypothesis that no mechanism of sex dosage compensation is acting in the suborder Serpentes.

Catégories Science-Metrix
  • 1 - health sciences
  • 2 - biomedical research
  • 3 - developmental biology
Catégories INIST
  • 1 - sciences appliquees, technologies et medecines
  • 2 - sciences biologiques et medicales
  • 3 - sciences biologiques fondamentales et appliquees. psychologie
Catégories Scopus
  • 1 - Health Sciences ; 2 - Medicine ; 3 - Genetics(clinical)
  • 1 - Life Sciences ; 2 - Biochemistry, Genetics and Molecular Biology ; 3 - Genetics
Catégories WoS
  • 1 - science ; 2 - genetics & heredity
  • 1 - science ; 2 - biochemistry & molecular biology
Identifiant ISTEX
6DEF38F3E00CE046860323FE140195F7DF860FE6
Revue

Chromosoma

Année de publication
1969
Présence de XML structuré
Non
Version PDF
1.3
Score qualité du texte
7.986
Sous-corpus
  • Reptiles
Type de publication
Journal
ark:/67375/1BB-1VVDVMBB-P
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