scholarly journals Seasonal gene expression kinetics between diapause phases in Drosophila virilis group species and overwintering differences between diapausing and non-diapausing females

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Tiina S. Salminen ◽  
Laura Vesala ◽  
Asta Laiho ◽  
Mikko Merisalo ◽  
Anneli Hoikkala ◽  
...  
Keyword(s):  
Gene Expression ◽  
Drosophila Virilis ◽  
Virilis Group ◽  
Drosophila Virilis Group ◽  
Group Species ◽  
Expression Kinetics

scholarly journals The genetics of postzygotic isolation in the Drosophila virilis group.

Genetics ◽  
1989 ◽  
Vol 121 (3) ◽  
pp. 527-537 ◽  
Author(s):  
H A Orr ◽  
J A Coyne
Keyword(s):  
Reproductive Isolation ◽  
X Chromosome ◽  
Related Species ◽  
Hybrid Sterility ◽  
Drosophila Virilis ◽  
Female Sterility ◽  
Postzygotic Isolation ◽  
Male And Female ◽  
Virilis Group ◽  
Drosophila Virilis Group

Abstract In a genetic study of postzygotic reproductive isolation among species of the Drosophila virilis group, we find that the X chromosome has the largest effect on male and female hybrid sterility and inviability. The X alone has a discernible effect on postzygotic isolation between closely related species. Hybridizations involving more distantly related species also show large X-effects, although the autosomes may also play a role. In the only hybridization yet subjected to such analysis, we show that hybrid male and female sterility result from the action of different X-linked loci. Our results accord with genetic studies of other taxa, and support the view that both Haldane's rule (heterogametic F1 sterility or inviability) and the large effect of the X chromosome on reproductive isolation result from the accumulation by natural selection of partially recessive or underdominant mutations. We also describe a method that allows genetic analysis of reproductive isolation between species that produce completely sterile or inviable hybrids. Such species pairs, which represent the final stage of speciation, cannot be analyzed by traditional methods. The X chromosome also plays an important role in postzygotic isolation between these species.

THE STUDY OF GENIC VARIATION BY ELECTROPHORETIC AND HEAT DENATURATION TECHNIQUES AT THE OCTANOL DEHYDROGENASE LOCUS IN MEMBERS OF THE DROSOPHILA VIRILIS GROUP

Genetics ◽  
1975 ◽  
Vol 80 (3) ◽  
pp. 637-650
Author(s):  
R S Singh ◽  
J L Hubby ◽  
L H Throckmorton
Keyword(s):  
Genetic Variation ◽  
Drosophila Virilis ◽  
Heat Denaturation ◽  
Virilis Group ◽  
Group A ◽  
Genic Variation ◽  
Drosophila Virilis Group ◽  
Octanol Dehydrogenase

ABSTRACT Heat denaturation studies of three different electrophoretic allozymes of octanol dehydrogenase were performed from 10 species of the Drosophila virilis group. A total of 18 alleles were discovered, and in 3 species in which electrophoretic studies indicated that the locus was monomorphic, heat denaturation showed that the locus was polymorphic. We show that electrophoretic studies underestimate the number of alleles at this locus by a factor of 2.6 in these species. The results are discussed in the light of the continuing controversy over selection and neutral theories of genetic variation.

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