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Indian Journal of Experimental Biology (IJEB) >
IJEB Vol.48 [2010] >
IJEB Vol.48(05) [May 2010] >
| Title: | Racial divergence of a rare laboratory evolved centromeric fission Cytorace of nasuta-albomicans complex of Drosophila |
| Authors: | Bijaya, Thongatabam
Ramachandra, Nallur B |
| Keywords: | Centric fission
Fissioncytorace-1
Recombinational raciation |
| Issue Date: | May-2010 |
| Publisher: | CSIR |
| Abstract: | Fissioncytorace-1, a member of the nasuta-albomicans
complex of Drosophila is
an evolutionary product of centric fission, which had occurred in the chromosome
X3 of Cytorace 1, a hydridization product of Drosophila nasuta nasuta male
(2n=8) and Drosophila nasuta albomicans female (2n=6). Cytorace 1 (males
2n=7; females 2n=6) has inherited this chromosome from its D. n. albomicans parent.
The chromosome X3 of D. n. albomicans is a derivative of a centric
fusion between the acrocentric chromosome 3 and the chromosome X of D. n. nasuta.
The Fissioncytorace-1 has crossed 200 generations from the time of its
evolution in the laboratory environment. When this centromeric fission race was
subjected to some of the morphophenotypic and fitness assessment to find its
overall population fitness showed, increased body size, sternopleural bristle,
ovarioles, lifetime fecundity and fertility with reduced interspecific
competitive ability and hatching success when compared with its parent
(Cytorace 1). These results suggest that the hybrid races must have encountered
an early event of recombinational raciation during their evolution in the
laboratory environment, which is a unique observation in animal system
illustrating the increase in the tempo of evolution after the event of
hybridization. |
| Page(s): | 511-517 |
| ISSN: | 0975-1009 (Online); 0019-5189 (Print) |
| Source: | IJEB Vol.48(05) [May 2010]
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