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PMID: 11841192 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't

Morphologically differentiated sex chromosomes in neotropical freshwater fish.

Genetica ·Vol. 111 ·No. 1-3 ·2001-00-00 ·Pages 91-100

de Almeida Toledo LF, Foresti F

Abstract

A general survey of the occurrence of morphologically differentiated sex chromosomes in the neotropical freshwater fishes is presented. The total number of 32 occurrences involving simple XX-XY and ZZ-ZW, and multiple X1X2Y, XY1Y2 and ZW1W2 sex chromosome systems is described, with comments on the aspects of sex chromosome evolution in this fish fauna. The occurrence of different sex chromosome systems in related species of the same genus, or in different populations of the same nominal species, involving male and sometimes female heterogamety, and differences in the molecular composition of sex-linked heterochromatin, are considered as indicative of the early stage of sex chromosomes evolution in fish.

MeSH Terms
Animals Female Fishes/genetics Fresh Water Karyotyping Male Sex Chromosomes Species Specificity
Authors & Affiliations
2 authors, click to expand affiliations / ORCID
de Almeida Toledo L F
Departamento de Biologia, Instituto de Biociências, Universidade de São Paulo, SP, Brasil. [email protected]
Foresti F
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Article Info
Journal
Genetica
Abbr.
Genetica
ISSN
0016-6707
DOI
10.1023/a:1013768104422
Email
[email protected]
Published
2001-00-00
Pages
91-100
Language
English
Region
Netherlands
NLM ID
0370740
Subset
IM
External Links
PubMed source DOI: 10.1023/a:1013768104422 View journal details
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