High divergence of reproductive tract proteins and their association with postzygotic reproductive isolation in Drosophila melanogaster and Drosophila virilis group species

1995 ◽  
Vol 41 (6) ◽  
Author(s):  
Alberto Civetta ◽  
RamaS. Singh
Keyword(s):  
Drosophila Melanogaster ◽  
Reproductive Isolation ◽  
Reproductive Tract ◽  
Drosophila Virilis ◽  
Postzygotic Reproductive Isolation ◽  
Virilis Group ◽  
Drosophila Virilis Group ◽  
Group Species

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.

scholarly journals Multiple Genes Cause Postmating Prezygotic Reproductive Isolation in the Drosophila virilis Group

2016 ◽  
Vol 6 (12) ◽  
pp. 4067-4076 ◽  
Author(s):  
Yasir H Ahmed-Braimah
Keyword(s):  
Reproductive Isolation ◽  
Evolutionary Biology ◽  
Drosophila Virilis ◽  
Chromosome 2 ◽  
Reproductive Barriers ◽  
Zygote Formation ◽  
Virilis Group ◽  
Genetic Level ◽  
Genomic Regions ◽  
Drosophila Virilis Group

Abstract Understanding the genetic basis of speciation is a central problem in evolutionary biology. Studies of reproductive isolation have provided several insights into the genetic causes of speciation, especially in taxa that lend themselves to detailed genetic scrutiny. Reproductive barriers have usually been divided into those that occur before zygote formation (prezygotic) and after (postzygotic), with the latter receiving a great deal of attention over several decades. Reproductive barriers that occur after mating but before zygote formation [postmating prezygotic (PMPZ)] are especially understudied at the genetic level. Here, I present a phenotypic and genetic analysis of a PMPZ reproductive barrier between two species of the Drosophila virilis group: D. americana and D. virilis. This species pair shows strong PMPZ isolation, especially when D. americana males mate with D. virilis females: ∼99% of eggs laid after these heterospecific copulations are not fertilized. Previous work has shown that the paternal loci contributing to this incompatibility reside on two chromosomes, one of which (chromosome 5) likely carries multiple factors. The other (chromosome 2) is fixed for a paracentric inversion that encompasses nearly half the chromosome. Here, I present two results. First, I show that PMPZ in this species cross is largely due to defective sperm storage in heterospecific copulations. Second, using advanced intercross and backcross mapping approaches, I identify genomic regions that carry genes capable of rescuing heterospecific fertilization. I conclude that paternal incompatibility between D. americana males and D. virilis females is underlain by four or more genes on chromosomes 2 and 5.

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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