Nom du corpus

Corpus Systématique Animale

Titre du document

The chromosomes of Dall's porpoise, Phocoenoides dallii (True), with remarks on the phylogenetic relation of the Cetacea

Lien vers le document
Éditeur
Springer (journals)
Langue(s) du document
Anglais
Type de document
Research-article
Nom du fichier dans la ressource
Mammiferes_v2b_00459
Auteur(s)
  • Sajiro Makino
Affiliation(s)
  • Zoological Institute, Hokkaido University, Sapporo
Résumé

The chromosome complex of Dall's porpoise Phocoenoides dallii (True), a species of the Delphinidae (Cetacea), was investigated in male germ cells during the course of spermatogenesis. The diploid number of chromosomes in this species was 44 in the spermatogonia and the haploid number was 22 in both primary and secondary spermatocytes. Sex chromosomes of the typical XY-type were found to occur in this species. The X element is represented by one of the medium-sized chromosomes of rod-type characterized by a globular body located at its inner extremity, while the Y is very minute, attaining a size approximately one third that of the smallest autosome. Morphological analysis of the chromosomes shows the chromosome complement of this species to be strikingly characterized by the prevalence of medium-sized elements having subterminal fibre attachments. Comparison of the chromosomes with those of related forms of mammals shows that the chromosome constitution of this species approximates closely that of the pig. The question of the phylogenetical affinity of the Cetacea was discussed on the basis of the karyological evidence here reported.

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
  • 4 - vertebres: anatomie et physiologie, organisme dans son ensemble ou etude de plusieurs organes ou systemes
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
C503A16039DD507DA97CF02261F07BA161E61968
Revue

Chromosoma

Année de publication
1950
Présence de XML structuré
Non
Version PDF
1.3
Score qualité du texte
9.112
Sous-corpus
  • Mammiferes
Type de publication
Journal
ark:/67375/1BB-F5FF7LCD-S
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