Patterns of replication in the neo-sex chromosomes ofDrosophila nasuta albomicans

被引：0
作者：
G. Mahesh
N B Ramachandra
H A Ranganath
机构：
[1] University of Mysore,Drosophila Stock Centre, Department of Studies in Zoology
来源：
Journal of Biosciences | 2000年 / 25卷
关键词：
Centric fusion; neo-sex chromosomes; replication pattern;
D O I：
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学科分类号：
摘要：
Drosophila nasuta albomicans (with 2n = 6), contains a pair of metacentric neo-sex chromosomes. Phylogenetically these are products of centric fusion between ancestral sex (X, Y) chromosomes and an autosome (chromosome 3). The polytene chromosome complement of males with a neo-X- and neo-Y-chromosomes has revealed asynchrony in replication between the two arms of the neo-sex chromosomes. The arm which represents the ancestral X-chromosome is faster replicating than the arm which represents ancestral autosome. The latter arm of the neo-sex chromosome is synchronous with other autosomes of the complement. We conclude that one arm of the neo-X/Y is still mimicking the features of an autosome while the other arm has the features of a classical X/Y-chromosome. This X-autosome translocation differs from the other evolutionary X-autosome translocations known in certain species ofDrosophila.
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页码：229 / 234
页数：5
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