Origin and evolution of the sex chromosomes in birds
Biocell
;
23(2): 79-95, Aug. 1999.
Article
Dans Anglais
| LILACS
| ID: lil-340373
ABSTRACT
A scheme is proposed to explain the process of sex chromosome differentiation in the class Aves. It is based on the restriction of recombination in an ancestral homomorphic ZW pair and the subsequent degeneration of the non-recombining region of the W chromosome leading to the highly heteromorphic sex chromosomes of carinate birds. The model presented here and Ohno's model of sex chromosome differentiation in Ophidia are the only integral models of sex chromosome evolution based on cytological evidences. The co-existence among living birds of mostly homomorphic (Ratites) and highly heteromorphic ZW pairs (carinates) provides a unique ground to study the mechanisms of sex chromosome differentiation in vertebrates
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Indice:
LILAS (Amériques)
Sujet Principal:
Chromosomes sexuels
/
Oiseaux
/
Évolution biologique
Limites du sujet:
Animaux
langue:
Anglais
Texte intégral:
Biocell
Thème du journal:
Clulas
Année:
1999
Type:
Article
Pays d'affiliation:
Argentine
Institution/Pays d'affiliation:
Facultad de Medicina/AR
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