Accumulating postzygotic isolation genes in parapatry: a new twist on chromosomal speciation.
TLDR
It is found that, if reproductive isolation is produced by the accumulation in parapatry of sets of alleles compatible within but incompatible across species, chromosomal rearrangements are far more likely to favor it than classical genetic barriers without chromosomal changes.Abstract:
Chromosomal rearrangements can promote reproductive isolation by reducing recombination along a large section of the genome. We model the effects of the genetic barrier to gene flow caused by a chromosomal rearrangement on the rate of accumulation of postzygotic isolation genes in parapatry. We find that, if reproductive isolation is produced by the accumulation in parapatry of sets of alleles compatible within but incompatible across species, chromosomal rearrangements are far more likely to favor it than classical genetic barriers without chromosomal changes. New evidence of the role of chromosomal rearrangements in parapatric speciation suggests that postzygotic isolation is often due to the accumulation of such incompatibilities. The model makes testable qualitative predictions about the genetic signature of speciation.read more
Citations
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Journal ArticleDOI
Hybridization and speciation
Richard J. Abbott,Dirk C. Albach,Stephen W. Ansell,Jan W. Arntzen,Stuart J. E. Baird,Nicolas Bierne,Janette W. Boughman,Alan Brelsford,C. A. Buerkle,Richard J. A. Buggs,Roger K. Butlin,Ulf Dieckmann,Fabrice Eroukhmanoff,Andrea Grill,Sara Helms Cahan,Jo S. Hermansen,Godfrey M. Hewitt,Alan G. Hudson,Chris D. Jiggins,Julia C. Jones,Barbara Keller,T. Marczewski,James Mallet,Paloma Martínez-Rodríguez,Markus Möst,Sean P. Mullen,Richard A. Nichols,Arne W. Nolte,Christian Parisod,Karin S. Pfennig,Amber M. Rice,Michael G. Ritchie,Burkhardt Seifert,Carole M. Smadja,Rike B. Stelkens,Jacek M. Szymura,Risto Väinölä,Jochen B. W. Wolf,Dietmar Zinner +38 more
TL;DR: A perspective on the context and evolutionary significance of hybridization during speciation is offered, highlighting issues of current interest and debate and suggesting that the Dobzhansky–Muller model of hybrid incompatibilities requires a broader interpretation.
Journal ArticleDOI
Divergent selection and heterogeneous genomic divergence.
TL;DR: It is concluded that divergent selection makes diverse contributions to heterogeneous genomic divergence, and the number, size, and distribution of genomic regions affected by selection varied substantially among studies, leading us to discuss the potential role of Divergent selection in the growth of regions of differentiation (i.e. genomic islands of divergence), a topic in need of future investigation.
Journal ArticleDOI
Chromosome Inversions, Local Adaptation and Speciation
TL;DR: The evolution of inversions that capture locally adapted alleles when two populations are exchanging migrants or hybridizing is studied to cause loci responsible for adaptive species-specific differences to map to inversions.
Journal ArticleDOI
The role of reinforcement in speciation: Theory and data
TL;DR: It is concluded that reinforcement has probably not been looked for where it is most likely to occur, and many further areas of study are pinpointed that may ultimately provide a strong assessment of the importance of reinforcement in speciation.
Journal ArticleDOI
Genomic islands of speciation in Anopheles gambiae.
TL;DR: Despite appreciable levels of gene flow between the M and S forms of A. gambiae, three small regions of differentiation are isolated where genes responsible for ecological and behavioral isolation are likely to be located, and it is expected reproductive isolation to be due to changes at a small number of loci.
References
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TL;DR: The results of an international collaboration to produce and make freely available a draft sequence of the human genome are reported and an initial analysis is presented, describing some of the insights that can be gleaned from the sequence.
Journal ArticleDOI
Chromosomal rearrangements and speciation.
TL;DR: It is argued that rearrangements reduce gene flow more by suppressing recombination and extending the effects of linked isolation genes than by reducing fitness.
Journal ArticleDOI
The genic view of the process of speciation
TL;DR: Significantly, the genetic architecture underlying RI, the patterns of species hybridization and the molecular signature of speciation genes all appear to support the view that RI is one of the manifestations of differential adaptation, as Darwin (1859) suggested.