In:
Proceedings of the National Academy of Sciences, Proceedings of the National Academy of Sciences, Vol. 98, No. 12 ( 2001-06-05), p. 6714-6719
Abstract:
The genetic basis of sexual isolation that contributes to
speciation is one of the unsolved questions in evolutionary biology. Drosophila ananassae and Drosophila
pallidosa are closely related, and postmating isolation has not
developed between them. However, females of both species discriminate their mating partners, and this discrimination contributes to strong
sexual isolation between them. By using surgical treatments, we demonstrate that male courtship songs play a dominant role in female
mate discrimination. The absence of the song of D.
pallidosa dramatically increased interspecies mating with D. ananassae females but reduced intraspecies mating
with D. pallidosa females. Furthermore, genetic analysis
and chromosomal introgression by repeated backcrosses to D.
pallidosa males identified possible loci that control female
discrimination in each species. These loci were mapped on distinct positions near the Delta locus on the middle of the left
arm of the second chromosome. Because the mate discrimination we studied is well developed and is the only known mechanism that prevents
gene flow between them, these loci may have played crucial roles in the evolution of reproductive isolation, and therefore, in the speciation
process between these two species.
Type of Medium:
Online Resource
ISSN:
0027-8424
,
1091-6490
DOI:
10.1073/pnas.091421598
Language:
English
Publisher:
Proceedings of the National Academy of Sciences
Publication Date:
2001
detail.hit.zdb_id:
209104-5
detail.hit.zdb_id:
1461794-8
SSG:
11
SSG:
12
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